bluuebunny/crossref_metadata_2025_split huggingface dataset:
144 Effect of Protein Source on Piglet Performance and Dietary Protein Digestibility in Regular Nursery and Escherichia Coli Challenged Conditions
Authors: Hu Qiong , Hackenhaar Leandro , Paton Neil , de Laat John , Newcomb Mark 
Published: October 2023

Abstract
Compared with conventional soybean meal (SBM), processed soy protein has been demonstrated to have greater nutrient digestibility, leading to better animal growth performance and gut health. The aim of the present study was to test hypothesis that Provisoy, a SBM product produced via hydrothermal mechanical treatment could improve weaning piglet growth performance via greater crude protein (CP) digestibility compared with SBM, and this benefit would be greater in pigs under Escherichia coli (ETEC) challenged conditions. A total of 268 weaned pigs [initial body weight (BW) = 6.82 ± 0.85 kg] were allotted to a split plot design and pigs were housed in either a regular nursery condition (5 pigs/pen, 10-11 pens/treatment) or an ETEC challenged condition (3 pigs/pen, 12 pens/treatment, 1 pig per pen was orally gavaged with 10 mL O149K91K88 on d 5 post-weaning). All pigs were fed one of the following diets: SBM, Provisoy or HP300. A standard wheat-barley-SBM based nursery diet was used and test soy products were added to replace SBM in the treatment diets. All diets were formulated to be isocaloric and had similar standardized ileal digestible lysine level in a three-phase (38 days) nursery program. One pig per pen was euthanized for ileal digesta and fecal samples were collected on post-weaning day 13 and 14. Data were analyzed by general linear model in R. In summary, there was no interaction between challenge condition and dietary protein source on intake and gain throughout all three phases. A significant interaction in G:F between d 0-7 post-weaning (P &lt; 0.05) was observed. As expected, pigs performed better in regular conditions compared with challenged conditions (P &lt; 0.05). Dietary protein source significantly affected ADG (P &lt; 0.05) and BW (P &lt; 0.01) on post-weaning d 7 regardless of challenge condition, with pigs fed Provisoy exhibiting increased ADG and d 7 BW versus the control but not different than HP300. Similar improvements in growth performance were observed during d 7-12 post-weaning. However, the effect of protein source on piglet growth was no longer evident during the last phase of nursery. There was no interaction observed between challenge condition and protein source on CP apparent ileal digestibility (AID) or apparent total tract digestibility (ATTD). Dietary protein source affected CP ATTD (P &lt; 0.01), with Provisoy treatment having the greatest value compared with other treatments. Challenge conditions tended to decrease CP AID (P = 0.109). In conclusion, dietary inclusion of Provisoy could improve piglet growth performance during the early nursery phase regardless of challenge condition and this benefit was likely partially due to better CP digestibility.
243 The Effect of Totally or Partially Replacing Soybean Meal by Alternative Protein Sources on Performance and Carcass Characteristics of Growing Finishing Pigs
Authors: Guan Xiaonan , van Dijk Albert , Molist Francesc 
Published: October 2023

Abstract
In many countries, soybean meal (SBM) is the premier protein source in pig diets because of the optimal amino acid (AA) content. However, due to developments in sustainability and local availability of SBM, it is of great interest for the feed industry to explore the effect on the growth performance and carcass characteristics of replacing SBM inclusion in pig diets by alternative protein sources. The objective of the current study was to explore the effect of partially and/or totally replacement of SBM in the starter, grower and finisher diets formulating based on the same NE, dig AA/NE, and similar AA profile on the growth performance and carcass characteristics of growing-finishing pigs (25 kg to slaughter at ±120 kg). In total, 120 boars and 120 gilts (Top Pi x T20) entered the experiment with an average body weight of 23.4 ± 1.87 kg and age of 61.4 ± 1.43 days. Pigs were blocked and randomly allocated to four dietary treatments depending on the inclusion level of SBM in the starter, grower and finisher phases. In treatment 1, the starter, grower and finisher feeds contained 16.0, 12.0 and 8.0% of SBM, respectively. In treatment 2, the starter, grower and finisher feeds contained 10.8, 8.1 and 0% of SBM, respectively. In treatment 3, the starter, grower and finisher feeds contained 5.3, 0 and 0% of SBM, respectively. In treatment 4, none of the feeds contained SBM. Pigs were housed in pens with 10 pigs per pen. The pens were equipped with individual feeding stations (IVO-G stations), which allowed for the measurement of individual feed intake. Pigs were individually weighed at the start of the experiment and at the diet changes at approximately 50 and 80 kg body weight and slaughter (±120 kg). During the grower phase, pigs fed according to treatment 1 showed reduced ADFI than the other treatment groups (1.91 vs. 2.0, 2.02 and 2.02 kg/d, P = 0.021) and subsequently decreased ADG (882 g/d vs. 927, 924 and 948 g/d, P = 0.005). Similar results were found during the starter + grower phases, where the pigs fed according to treatment 1 showed less ADFI than the other treatment groups pigs (1.63 vs. 1.71, 1.73 and 1.71 kg/d, P = 0.013) and subsequently less ADG (842 vs. 878, 878 and 874 g/d, P = 0.039). No major differences were found regarding the carcass characteristics. In conclusion, feed intake and growth performance were improved and carcass quality was not penalized by totally or partially replacing the SBM by other protein rich feedstuffs including rape seed meal (RSM), sunflower seed meal (SFM) and peas in diets for growing-fishing pigs.
238 Impact of Increasing Standardized Ileal Digestible Tryptophan to Lysine Ratio in Diets Containing 20% Corn Distillers Dried Grains with Solubles fed to Growing-Finishing Pigs
Authors: Xue Pengcheng , McGhee Molly L , Pilcher, Qingyun Chad M , Zhang Zhenbin 
Published: October 2023

Abstract
A study was conducted to investigate the optimal standardized ileal digestible (SID) Trp to Lys ratio in diets containing a moderately high level (20%) of corn distillers dried grains with solubles (DDGS) fed to growing-finishing pigs. A total of 2,232 pigs [initial body weight (BW) = 31.41 kg ± 0.53 kg] were allotted to a randomized complete block design with 4 dietary treatments (18 pens/treatment; 31 pigs/pen, mixed gender) and fed experimental diets for 15 wk in a 6-phase feeding program. The level of SID Trp/Lys in each treatment was formulated to 0.15, 0.18, 0.21, and 0.24, respectively, and was manipulated by crystalline Trp inclusion. Within each phase, diets were formulated to be isocaloric and contained equal provisions of SID Lys, sulfur containing amino acids, Thr, and Ile. Diets met or exceeded NRC (2012) estimated nutrient requirements. The levels of SID Thr/Lys (0.65 – 0.70 from grower to finisher) and SID Ile/Lys (0.60 – 0.62 from grower to finisher) were adjusted to a greater level to accommodate the potential negative effects of greater levels of fiber and Leu, respectively, from the inclusion of DDGS. Results were analyzed using the lme4 package of R 4.1.2, and the statistical models included the fixed effect of SID Trp/Lys and the random effect of body weight block. Orthogonal contrasts were used to test linear and quadratic effects of increasing dietary SID Trp/Lys (Table 1). Results indicated that increasing SID Trp/Lys in diets containing 20% corn DDGS improved final body weight (FBW) in a quadratic pattern (128.67, 130.61, 130.83, and 130.37 kg, for diets formulated to SID Trp/Lys at 0.15, 0.18, 0.21, and 0.24, respectively, P &lt; 0.05). Average daily feed intake (ADFI) was quadratically increased with increasing SID Trp/Lys (2.51, 2.57, 2.60, and 2.57 kg/d, respectively, P &lt; 0.05). A linear tendency was observed on average daily gain (ADG) with increasing SID Trp/Lys (0.96, 0.98, 0.98, and 0.98 kg/d, respectively, P &lt; 0.10). In summary, increasing SID Trp/Lys in diets with moderately high levels of corn DDGS improved FBW and ADFI in a quadratic pattern and tended to increase ADG linearly.
150 A new Bacterial Phytase can act as an Overdose Concept, at low Levels, in Improving the Performance and Carcass Characteristics of Nursery and Finishing Pigs
Authors: da Silva Caio A , Hideshima Cristina , Souza Kelly , Callegari Marco A , Dias Cleandro A , Silva Claudia C , Sens Rafael , Fascina Vitor 
Published: October 2023

Abstract
This study aimed to evaluate the effect of doses of a new bacterial phytase (HiPhorius, DSM Nutritional Products) on the performance and carcass characteristics of pigs in the nursery and finishing phases. Barrows and gilts (n = 250, 21 d-old and initial body weight (BW) = 6.07 ± 0.73 kg were randomized in blocks design and submitted to 5 treatments. The pigs were fed five corn-soybean meal-based diets: positive control (PC), supplemented with inorganic phosphorus and calcium; negative control (NC), with 0.18% reduction in available phosphorus and 0.16% in calcium; and three NC diets supplemented with 600, 1,200 and 1,800 phytase units (FYT)/kg in the feed. Daily BW (DWG), daily feed intake (DFI), feed conversion rate (FCR), and BW were measured at the end of each phase: pre-starter I (21-28d), pre-starter II (28-35d), starter I (35-49d), starter II (49-63d), growing I (63-91d), growing II (91-112d), finishing I (112-133d) and finishing II (133-156d) phases. Carcass yield, back fat height, loin depth, and lean meat yield were measured in the 156 d-old. Data were submitted to ANOVA, Tukey test and regression analysis. In the nursery (21-63d) diets with phytase levels were similar to PC for FCR (P &gt;0.05) and better to NC, with a quadratic effect (FCR = 1.671 - 0.0003X + 0.00000010526X2), being the best point 1,320 (FYT). The supplementation with phytase in grow-finishing phases (63 -156 d) were similar to PC (P &gt; 0.05) for DWG, DFI and FCR (P &lt; 0.05) and better than NC, which were identified a regression effect (DWG = 0.8543 + 0.0001X; DFI = 2.1453 + 0.0007X - 0.00000029618X2; FCR = 2.6924 - 0.0004X + 0.00000012768X2), with the best levels of phytase of 1,296 and 1,404 FYT for DFI and FCR, respectively. The supplementation of phytase improved the carcass yield, loin depth, kilogram of lean meat and percentage of lean meat when compared with NC diet. Supplementing levels of HiPhorius to a corn and soybean meal-based diet with inorganic P and Ca reduction improved performance and carcass traits of pigs after weaning until slaughter age.
153 Effect of Exogenous Phytase on the Digestibility of Amino Acids and Phosphorus in Standard and High Phytin Swine Diets
Authors: Wise Tanner , Haetinger Vitor , Alagbe Emmanuel , Sorbara Jose-Otavio , Adeola Olayiwola 
Published: October 2023

Abstract
The objective of the following study was to investigate the effect of exogenous phytase (Hiphorius 40, DSM Nutritional Products) on the standardized ileal digestibility (SID) of amino acids (AA) and the apparent ileal digestibility (AID) of P in both standard and high phytin (HP) swine diets. The study consisted of 4 diets arranged in a 2 x 2 factorial of standard or high phytin and exogenous phytase at 0 or 1,000 FYT/kg; and one N-free diet. Ten crossbred male pigs fitted with ileal T-cannulas were allotted to the 5 dietary treatments in duplicate 5 x 4 incomplete Latin-square design. Pigs were fed for a total of four 7-d periods, where digesta was collected on d 6 and 7 of each period. Diet and digesta samples were analyzed for dry matter, N, Ti, AA, and P to determine AA and P digestibility. The SID of AA was determined by correcting the AID of AA for the basal endogenous losses estimated using the N-free diet. Data were subjected to an ANOVA where main effects of the diet type (standard vs. HP) and phytase were evaluated as well as the interaction of diet type and phytase. If the ANOVA was significant the means were separated by Tukey’s method. The basal endogenous AA losses of pigs in this study ranged from 0.115 (Met) to 0.921 (Thr) g/kg DM and 0.308 (Cys) to 9.455 (Pro) g/kg DM for indispensable and dispensable AA, respectively. The HP diets produced less SID of all AA compared with the standard diets (P &lt; 0.001) with an average SID reduction of 6.5% for indispensable AA. Phytase improved (P &lt; 0.05) the SID of Met, Lys, Arg, Cys, Glu and Ser and tended to improve (P &lt; 0.10) Leu, Thr, and Tyr. There were no significant diet type*phytase interactions. The AID of P was less (P &lt; 0.01) for the HP diets relative to the standard (39.12% vs. 45.84%), and phytase produced greater (P &lt; 0.01) AID of P for both diet types (25.62% vs. 59.34%). These data indicate that phytase can improve the digestibility of many AA and P in both standard and HP diets for growing pigs.
222 Effects of Nutritional Strategies of Growth Rate Manipulation During the Gilt Development Phases on Growth and Reproductive Performance
Authors: Leiva Samuel F , Rosero David S , Canavate Sergio , Anderson Brooke , Vier Carine M , Hidalgo Hugo , Diaz Julia A Calderon , Lu Ning , Orlando Uislei A 
Published: October 2023

Abstract
Our objective was to evaluate the effects of nutritional interventions for growth rate manipulation during the gilt development phases on growth and reproductive performance. A total of 810 Camborough L42 gilts from three gilt groups were received between 9 to 11 weeks of age. Gilts were individually weighed, and pens of gilts were allotted to one of two dietary treatments balanced by lot (birth week) and pen weight for a total of 24 pens/treatment. Treatments consisted of two levels of dietary nutrients:1) diets based on corn, soybean meal, and wheat middlings formulated to meet or exceed the PIC standardized ileal digestible (SID) lysine (Lys) recommendations with a total dietary fiber content (TDF) of 10, 10, and 11% (Adeq); and2) slower growing diets based on corn, soybean meal, wheat middlings, and corn germ where SID Lys was reduced by 6, 11, and 11%, dietary metabolizable energy level was reduced by 2.7, 4.6, and 4.7%, and TDF content was increased to 15, 18, and 20% (Low). Diets were fed in three phases as 27.2 to 54.5 kg, 54.5 to 81.8 kg, and 81.8 to 113.6 kg of body weight (BW). At the end of phase 3, gilts were individually weighed and the number of selected gilts per pen was recorded. After selection, gilts were heat checked with the date of heat-no-service (HNS) recorded and then sent to sow farms for breeding in the next recorded heat. Data were analyzed using generalized linear mixed models considering treatment as fixed effect, lot as random effect, and covariates were included if they were statistically significant and improved model fit. Gilts fed the Low diets had less overall average daily gain compared with gilts fed Adeq diets (P &lt; 0.05; Table 1). This response was mainly driven by a marginal significant reduction (P &lt; 0.10) in average daily feed intake for the gilts fed Low diets compared with Adeq, with no evidence for differences (P &gt; 0.10) in overall feed efficiency. As a result of the reduction in growth rate, gilts fed the Low diets were 4.8 kg lighter (P &lt; 0.05) at selection compared with gilts fed Adeq diets. There was no evidence for treatment differences in selection rate, breeding rate, age at first HNS nor age at first breeding (P &gt; 0.10). In summary, results from this study demonstrated that nutritional strategies can be applied to reduce developing gilts growth rate without negatively affecting puberty, selection rate, or age at first breeding.
219 Effects of Precision Feeding and the “Bump Feeding” Strategy in Gestating Sows on Performances and Body Condition in Sows Monitored for the First Two Gestation-Lactation Cycles
Authors: Cloutier Laetitia , Galiot Lucie , Guay Frédéric , Dumas Gabrielle , Gaillard Charlotte , Dourmad Jean-Yves , Simongiovanni Aude , Gagnon Patrick 
Published: October 2023

Abstract
The introduction of precision feeding in sows depends on a precise estimation of its potential benefits. The goal of this study was to evaluate the effects of precision feeding and feed intake during gestation on gilt performances during two gestation cycles. Four isoenergetic treatments were compared: two constant-concentration feeding strategies (0.53% Lys DIS), one with constant feed intake (FF; flat feeding) and the other variable (BF; “bump feeding”, with decreased feed intake before 90 days of gestation, then greater feed intake until parturition), and two precision-feeding strategies based on the InraPorc model, one by parity (APP) and the other considering the body weight of the gilt at breeding (API). A total of 333 gilts were followed from breeding to weaning for two gestation and lactation cycles. Body weight and backfat depth were measured at breeding, 90 days of gestation, parturition, and weaning. Feed consumption was monitored daily. Litter variables were measured as birth and weaning weight, mortality, and overall gain. A mixed model was used to analyze differences between the four treatments using the sow as the experimental unit. Results showed that APP gilts gained more body weight during the gestation than FF gilts (65.1 vs 61.7 kg; P = 0.01) but no difference remained at the end of lactation (P &gt; 0.10). Mobilization of backfat depth was more important during lactation in the APP group compared with FF and BF treatments (3.4 vs 2.9 mm; P = 0.03). BF and APP gilts had greater total birth litter weight than API gilts (400 g and 600 g greater, respectively), with FF gilts being intermediate (P = 0.02). However, the effect faded out with no difference on weaning weight and overall lactation gain weight (P &gt; 0.10). The APP gilts had more weaned piglets than BF or FF gilts (+0.6 piglet, P = 0.01). During the second cycle, API sows gained more body weight during gestation than FF sows (58.8 vs 55.7 kg; P = 0.05). Yet, no significant difference was observed at the end of lactation. For the backfat depth, API sows had greater backfat depth during gestation than FF sows (1.83 vs 1.1 mm; P = 0.05) and a greater mobilization during lactation (2.68 vs 2.0 mm; P = 0.08). No effect was seen on litter mortality. In the same way, no significant effect was observed in the litter performances (P &gt; 0.1). Initial results from this study seem to show a benefit of precision feeding for gilts, but with less effect for their second parity. However, no clear benefit was observed from the bump feeding strategy.
214 Effects of Dietary Standardized Ileal Digestible (SID) Lysine (Lys) Levels and Dietary SID Tryptophan to Lys Ratios on Growth Performance of Late-Nursery Maternal Barrows
Authors: Lu Ning , Vier Carine M , Hewett Ellie , Parr Eric , Van De Stroet Denise , Estrada Jorge , Welsch Michael , Cast Wayne R , Navales Ron A , Montoro Jordi Camp , Zaragoza Luis E , Dritz Steve , Orlando Uislei A 
Published: October 2023

Abstract
The objective was to determine the effects of dietary standardized ileal digestible (SID) lysine (Lys) levels and SID tryptophan (Trp) to Lys ratios on the growth performance of late-nursery maternal barrows. A total of 2,293 barrows (PIC Camborough, initially 11.9 ± 0.35 kg) were used in a 28-day trial with 96 mixed-sex pens in two rooms (48 pens/room), 16 pens/treatment, and 23 to 25 pigs/pen. Pens were blocked by body weight (BW) and randomly allotted to 1 of 6 treatments in a 2×3 factorial arrangement. Treatment factors were: 1) Dietary SID Lys levels: meet PIC SID Lys recommendation at 1.234% (PIC LYS) or below PIC SID Lys recommendation at 0.988% (BELOW LYS); 2) Dietary SID Trp to Lys ratios: 21.0, 18.5, and 16.0. Data were analyzed using a linear mixed model in R Studio (Version 3.5.2, R Core Team; Vienna, Austria). Dietary SID Lys levels, dietary SID Trp to Lys ratios, and their interaction were included as fixed effects, and room and weight block were included as random effects in the model. Pigs fed with PIC LYS diets showed significantly improved average daily gain (ADG; 672 vs. 594 g; P &lt; 0.001), average daily feed intake (ADFI; 1227 vs. 1179 g; P &lt; 0.001), gain-to-feed ratio (G:F; 550 vs. 508 g/kg; P = 0.002), and greater amount of SID Lys intake (22.5 vs. 19.5; P &lt; 0.05) or Trp intake (4.2 vs. 3.6; P &lt; 0.05) per kg of BW gain comparing to BELOW LYS diets. Significant interactive effects were observed between dietary SID Lys levels and dietary SID Trp and Lys ratios on final BW, ADG, ADFI, and G:F (P &lt; 0.05; Table 1). For final BW and ADG, when feeding PIC LYS diets, decreasing dietary SID Trp to Lys ratios increased final BW and ADG (quadratic, P &lt; 0.05); but when feeding BELOW LYS diets the decreasing ratios reduced final BW and ADG (quadratic, P &lt; 0.05). For ADFI, when feeding PIC LYS diets, there was no evidence that decreasing dietary SID Trp to Lys ratios impacted ADFI (P &gt; 0.05); but when feeding BELOW LYS diets the decreasing ratios reduced ADFI (quadratic, P &lt; 0.05). When feeding PIC LYS diets, the decreasing dietary SID Trp to Lys ratios decreased and then increased G:F (quadratic, P &lt; 0.05); but when feeding BELOW LYS diets, the decreasing ratios increased and then decreased G:F (quadratic, P &lt; 0.05). In conclusion, late-nursery maternal barrows fed the PIC LYS diet had improved growth performance compared with those fed BELOW LYS diet; and decreasing dietary SID Trp to Lys ratios from 21.0 to 16.0 had deleterious impacts on growth performance when dietary SID Lys level was below PIC recommendation, but not when dietary SID Lys level met PIC recommendation.
208 Effect of SID LYS Level with Constant Non-Essential Amino Acids
Authors: Faris Richard , Hackenhaar Leandro 
Published: October 2023

Abstract
Many investigations on the effect of low protein diets reduce crude protein (CP) and have a constant standardized ileal digestible (SID) LYS resulting in reductions in ADG, ADFI, and gain:feed is some cases. This experiment was conducted to determine the impact of maintaining constant non-essential amino acids and changing SID LYS and other essential amino acids. For the experiment, 288 pigs (~22 d of age, 6.61 ± 0.95 kg, 8 replicates/treatment, 6 pigs/pen) were stratified by body (BW) and randomly allotted to one of 6 treatments in a randomized complete block design. Non-essential amino acids were fixed in all diets and synthetic amino acids were added to increase SID LYS from 1.15% to 1.4% while maintaining constant ratios of MET+CYS, THR, TRP, VAL, and ILE to LYS. Diets were corn, wheat, barley, and soy based with 1.1% corn starch in the least SID LYS diet. Synthetic amino acids were added to the diet at the expense of corn starch to maintain non-essential amino acid levels. The CP ranged from 17.8% when SID LYS was 1.15% and 18.6% when SID LYS was 1.4%. Experimental diets were fed for 21 d. Body weight, feed disappearance, visual fecal scores, and visual piglet scores were measured. Visual fecal scores (1 = normal to 4 = watery) and visual pig appearance scores (1 = pale and hairy to 4 = normal color and well-rounded muscle) were assessed on ordered likert scales to determine the probabilities of observing a more normal stool quality and a worse visual appearance, respectively. Performance data were analyzed as a general linear model. Stool quality and visual appearance were analyzed as a generalized linear mixed model. Contrasts were used to test linear and quadratic effects of dietary SID LYS. Results of the experiment are presented in Table 1. Increasing SID LYS with constant non-essential amino acids did not affect ADG or BW. The ADFI was linearly decreased (P &lt; 0.1) and gain:feed was linearly increased (P &lt; 0.0001) with increasing SID LYS (Table 1). Stool quality was not affected. Visual appearance of the pigs was quadratically affected (P &lt; 0.05) by changing SID LYS. Pigs that had consumed diets with the lowest or highest SID LYS had the best visual appearance (lowest probability). The results of the current experiment differ suggest SID LYS may regulate feed intake and nutrient efficiency, but BW gain is not affected when non-essential amino acids are held constant. This differs from cases where CP is reduced, which results are decreased growth in many cases.