bluuebunny/crossref_metadata_2025_split huggingface dataset:
133 Effect of feeding two different feed additives (Prime Force and Optipartum C+) on finishing cattle performance and carcass characteristics
Authors: Lorences Sofia Suarez , McDermott Rebecca L , Benton Josh R , Lemaster Willard , Bondurant Robert G , MacDonald James C , Erickson Galen E 
Published: September 2024

Abstract
A feedlot study was conducted to evaluate the effect of two feed additives, Prime Force (Furst-McNess Company, Rockford, IL) and Optipartum C+ (AB Vista, Plantation, FL), on finishing cattle performance and carcass characteristics. In this experiment, steers [n = 320; 390 ± 9.5 kg of body weight (BW)] were used and four treatments were evaluated in a total of 32 pens, with 10 steers per pen and 80 steers per treatment. Treatments were arranged in a 2 × 2 factorial and included a control diet with no additives; a diet containing Prime Force targeted at 68 g/steer daily; a diet containing Optipartum C+, targeted at 20 g/steer daily; and a diet containing a combination of both products (68 g/steer Prime Force and 20 g/steer Optipartum C+). Cattle were fed for 151 d, but treatments were imposed the last 67 d before slaughter (i.e., fed control diet to all cattle until d 84). Performance is for the total 151-d feeding period. No interaction between feed additives was observed for performance or carcass traits (P ≥ 0.41), therefore main effects are presented. Feeding Prime Force increased final BW (P &lt; 0.04) when compared with cattle not fed Prime Force. A tendency was observed for greater adjusted final BW (P = 0.06) and ADG (P = 0.08) for cattle fed Prime Force compared with cattle fed no Prime Force. Cattle fed Prime Force had numerically greater intake (P = 0.11) than cattle fed no Prime Force, therefore gain to feed (G:F) was not impacted (P = 0.54). Ribeye area and fat depth were not different (P ≥ 0.17) for cattle fed Prime Force versus cattle that had no Prime Force added to the diet, but marbling was numerically improved (P = 0.11) due to Prime Force. Carcass-adjusted final BW (P = 0.11) was numerically greater for cattle fed Optipartum C+ and ADG tended (P = 0.09) to be greater for cattle fed Optipartum C+ compared with cattle fed no Optipartum C+. Dry matter intake was not different (P = 0.54) for cattle fed Optipartum C+ versus cattle with no Optipartum C+ in the diet, therefore G:F was numerically improved (P = 0.13) by the increase in ADG for cattle fed Optipartum C+. Ribeye area, fat, and marbling were not different (P ≥ 0.30) between cattle fed Optipartum C+ and those that did not receive Optipartum C+ in the diet. Incidence of liver abscesses was not affected by feeding either additive (P = 0.40). Based on results from this study, adding Prime Force to a finishing diet tended to improve BW and ADG compared with cattle not fed Prime Force. Feeding Optipartum C+ tended to increase ADG and improve G:F due to equal DMI when compared with diets with no Optipartum C+ added.
123 Effects of a Saccharomyces cerevisiae based direct-fed microbial on performance, health, and rumen bacterial community of newly weaned beef steers during a 56-d receiving period
Authors: Treon Emily , Sidney Taylor S , Taiwo Godstime A , Idowu Modoluwamu , Leal Yarahy , Ologunagba Deborah , Ogunade Ibukun M 
Published: September 2024

Abstract
We examined the effects of a blend of Saccharomyces cerevisiae, multiple live probiotic bacteria and their fermentation products on performance, health, and the ruminal bacterial community of newly weaned beef steers during a 56-d receiving period. Newly weaned Angus crossbred steers [n = 40; 221 ± 25.6 kg body weight (BW); 180 ± 17 d of age] were stratified by BW into four pens (10 steers per pen) such that each pen had a similar average BW at the beginning of the experiment. The pens were randomly assigned to receive a corn silage basal diet (CON; n = 20) or the basal diet supplemented with 9 g·steer⁻¹·d⁻¹of PRO feed additive (PRO; n = 20). The PRO additive is a blend of Saccharomyces cerevisiae and the fermentation products of Enterococcus faecium, Bacillus licheniformis, Bacillus subtilis, Lactobacillus animalis, Propionibacterium freudenreichii. The DMI and water consumed were monitored using the GrowSafe intake nodes and custom flow meters, respectively. Body weights were recorded weekly to calculate average daily gain (ADG). Before morning feeding, 10 mL of blood was taken from each steer on d 0 to 7, and thereafter weekly for analyses of immune cells, plasma glucose and NEFAs. On d 56, rumen fluid samples (200 mL each) were collected from all the steers for microbiome analysis. Over the 56-d receiving period, the supplemental PRO had no effects on DMI, water intake, or ADG. However, compared with CON, beef steers fed supplemental PRO tended to have greater ADG (P = 0.08) and BW (P = 0.07) during the first 14 d of the study. There was a treatment × day interaction (P ≤ 0.05) for WBC, neutrophils and monocytes over the 56 d such that beef steers fed supplemental PRO had decreased blood concentrations on certain days during the first 7 d after weaning, indicating reduced inflammation or stress response. The results of the rumen microbiome analysis revealed that the relative abundance of complex fiber degrading or obligate proton-reducing bacterial genera such as Bacteroides, Ruminococcus gauvreauii group, Desulfovibrio, Syntrophococcus, and Acetitomaculum were greater (P ≤ 0.05) in beef steers fed supplemental PRO compared with CON. This study demonstrated that dietary supplementation of PRO improved the growth performance, reduced stress or inflammatory response during the initial days after weaning and altered the ruminal bacterial community towards increased relative abundance of bacterial genera associated with improved rumen function.
187 Exploring deep shotgun sequencing to understand the rumen microbial function in Angus bulls with divergent RFI EPD
Authors: Sidney Taylor S , Taiwo Godstime A , Treon Emily , Ogunade Ibukun M 
Published: September 2024

Abstract
We investigated the rumen microbiome of Angus bulls selected for Residual Feed Intake-Expected Progeny Difference (RFI-EPD) utilizing deep shotgun metagenomic sequencing. Negative RFI-EPD bulls (NegRFI: n = 10; RFI-EPD = -0.3883 kg/d) and Positive RFI-EPD bulls (PosRFI: n = 10; RFI-EPD = 0.2935 kg/d) were selected from a group of 59 Angus bulls [average body weight (BW) = 427.81 ± 18.77 kg] fed a high-forage total mixed ration after a 59-d testing period. At the end of the 59-d period, rumen fluid samples were collected for bacterial DNA extraction and subsequent shotgun metagenomic sequencing. Results of the metagenome analysis revealed greater gene richness in NegRFI bulls compared with PosRFI. Analysis of similarity revealed a significant difference (P = 0.05) in the rumen microbial community between the NegRFI and PosRFI. Linear Discriminant Analysis effect size (Lefse) was used to identify the differentially abundant taxa. The Lefse results showed that class Fibrobacteria (LDA = 5.1) and genus Fibrobacter (LDA = 4.8) were the most differentially enriched markers in NegRFI bulls, compared with PosRFI bulls. Relative abundance of the carbohydrate-active enzymes was also compared using lefse analysis. The results showed greater relative abundance of glycoside hydrolases and carbohydrate-binding modules such as GH5, CBM86, CBM35, GH43, and CBM6 (LDA &gt; 3.0) in NegRFI bulls whereas GH13 and GT2 were greater in PosRFI. The distinct metabolic and microbial profiles observed in NegRFI, compared with PosRFI bulls, characterized by greater gene richness and specific taxa such as Fibrobacter, and variations in carbohydrate-active enzymes, underscore the potential genetic and functional differences in their rumen microbiome. These findings contribute to a deeper understanding of the interplay between host genetics, microbiota, and feed efficiency in Angus bulls, opening avenues for targeted interventions and advancements in livestock management practices.
195 Effect of selection for growth and maternal influence on crossbred Angus heifer development
Authors: Garcia-Ascolani Mariana E , Briggs Emma A , Talley Samuel R , Rolf Megan M , Beck Paul A , Lalman David L 
Published: September 2024

Abstract
This multiyear experiment was designed to determine the effects of sire yearling weight (YW) and maternal influence (MILK) expected progeny differences (EPD) on production and fertility of beef replacement heifers. Sires were classified as moderate (&lt; 50th percentile) or high for YW EPD (122 ± 29; from 79 to 172) and as low (&lt; 50th percentile) or high for MILK EPD (27 ± 8; from 5 to 40). Fall-born (n = 214) and spring-born (n = 207) heifers were enrolled in the study. Birth weight (BW), weaning weight (WW), and YW of the heifers were measured. In addition, reproductive tract score (RTS), dry matter intake (DMI), and average daily gain (ADG) while consuming an unprocessed grass hay diet were determined in a subsample of enrolled heifers. Neogen Igenity Beef scores (NIBS) were also run on this subset. Pregnancy rate and conception rate at fixed timed artificial insemination (FTAI) were also determined. Adjusted BW, WW and YW and RTS were analyzed using the GLIMMIX procedure of SAS (9.4, SAS Institute Inc., Cary, NC), with YW and MILK EPD as fixed effects and year of birth as random effect. Effects of sire YW and MILK classification on the likelihood of pregnancy and successful FTAI were also analyzed using the GLIMMIX procedure of SAS. Pearson correlation coefficients between independent and dependent variables were obtained using the CORR procedure of SAS. Sire MILK EPD had no effect (P ≥ 0.13) on the body weight of fall- or spring-born heifers. However, fall-born heifers were 0.12 kg and 0.34 kg heavier (P = 0.06 and 0.001, respectively) per unit increase in sire YW EPD at weaning and yearling time, respectively. There was no effect of sire YW EPD on fall-born heifer DMI as percentage of body weight (DMI % BOW; P = 0.74) nor ADG (P = 0.90) while consuming the low-energy diet. Spring-born heifers had significantly greater (all, P ≤ 0.001) adjusted BW, WW, and YW (0.02, 0.23 and 0.37 kg per unit increase in sire YW EPD, respectively. Reproductive tract score was strong and negatively correlated (P ≤ 0.001) with DMI % BOW. Heifer YW NIBS were moderate and positively correlated (P &lt; 0.001) with ADG. There was a tendency (P = 0.09) for a weak and negative correlation between residual feed intake genetic scores and DMI % BOW. Sire genetic merit for yearling growth was transmitted to replacement heifers. However, neither ADG, nor unprocessed forage DMI % BOW was influenced by genetic potential for growth during this study. Further research is needed to assess the benefits of using genomic profile of heifers for maternal, performance and carcass traits, alongside sire EPDs, when selecting and developing beef replacement heifers.
399 Effect of feeding palm oil products on finishing cattle performance, carcass characteristics, and methane production
Authors: Kobza Anna M , McDermott Rebecca L , Benton Josh R , Norman Mitch M , Zou Long , MacDonald James C , Erickson Galen E 
Published: September 2024

Abstract
The objectives of this experiment were to evaluate feeding palm oil products on feedlot cattle performance and methane production. Steers (n = 320; 380 ± 14.5 kg) were allocated to 40 pens in a randomized block design and assigned to 1 of 5 treatments consisting of different sources of supplemental fat: 1) No Oil; negative control containing 0.0% supplemental fat, 2) Corn Oil; positive control containing 4.0% supplemental corn oil, 3) Whole Palm; 4.0% supplemental whole palm oil, 4) Olein; 4.0% supplemental palm olein oil, or 5) Stearin; 4.0% supplemental palm stearin oil. Cattle consuming Corn Oil, Olein and Stearin all had greater (P = 0.04) final body weight (BW) and hot carcass weight (HCW) than cattle consuming no oil but were not different (P &gt; 0.11) from each other or from Whole Palm, which was intermediate. Dry matter intake (DMI) of cattle consuming No Oil, Whole Palm and Stearin oil was not different from each other; however, cattle fed Corn Oil had greater intake than Whole Palm (P = 0.03). Corn Oil, Olein, and Stearin all had greater average daily gain (ADG) than cattle consuming No Oil (P = 0.04) but were not different (P &gt; 0.12) from Whole Palm. Adding fat improved feed efficiency (gain to feed; G:F) as all diets including added fat had greater (P &lt; 0.01) G:F than No Oil. Marbling scores were greater (P = 0.01) for Olein and Stearin than Corn and Whole Palm. There were no differences in backfat, ribeye area or liver abscess rate among any treatments (P &gt; 0.74). Gas emissions were evaluated for only the No Oil and Whole Palm treatments. Total methane and methane produced per pound of dry matter intake was less for cattle consuming Whole Palm than No Oil by 14.8% (P &lt; 0.04) while cattle were in the methane chamber. Methane produced per kilogram of ADG for Whole Palm was also reduced (P &lt; 0.01) by 21.4% compared with No Oil. The results of this study indicate feeding palm oil products as a source of supplemental fat in finishing diets increases final BW, ADG, and HCW compared with feeding no supplemental fat, but had minimal impact on DMI resulting in an improvement in G:F. Adding supplemental fat reduced methane emissions in cattle when feeding Whole Palm compared with No Oil. The value of palm oil products in feedlot finishing diets is comparable with feeding corn oil.
177 Awardee Talk: Residual feed intake in beef cattle: Biological basis and effect on response to dietary supplementation of rumen bypass protein
Authors: Idowu Modoluwamu , Ogunade Ibukun M , Sidney Taylor S 
Published: September 2024

Abstract
Using ruminal and plasma metabolomics, as well as 16S rRNA gene sequencing, we aimed to identify differences in host metabolome, rumen metabolome, and microbial community in beef steers with high (positive) or low (negative) residual feed intake (RFI) phenotypes. Our microbiome results revealed a greater relative abundance of Weissella, and Muribaculaceae in low-RFI beef steers, while Methanobrevibacter and Clostridium were reduced. Additionally, pathway enrichment analysis of the metabolome data revealed the enrichment of histidine metabolism, and arginine biosynthesis in the plasma of low-RFI beef steers. Overall, our results showed that selection for divergent RFI phenotype is associated with differences in rumen microbiome and overall animal metabolism, notably amino acid metabolism-related pathways, and therefore may be an important animal-related factor that can affect the response of beef cattle to nutritional interventions such as rumen bypass protein supplements. Feeding rumen-bypass protein to cattle has demonstrated positive impacts on weight gain and feed efficiency, especially in rapidly growing young calves. However, the increasing costs of feed protein and the challenges of excessive nitrogen discharge into the environment underscore the need for sustainable protein supplementation in ruminant diets. Although past research has aimed at enhancing amino acid utilization efficiency and/or reducing nitrogen excretion in ruminants by minimizing dietary protein content, there is a gap; no study has assessed how factors intrinsic to the animal, like feed efficiency status, might influence the response of ruminants to dietary protein supplements. In our follow-up study, we investigated the effects of rumen-bypass protein (RBP) supplements on growth performance, plasma and urinary nitrogen concentration, hepatic mitochondrial protein complexes, and mRNA expression of immune genes in crossbred beef steers with divergent negative or positive RFI phenotypes. We assessed the impact of RBP supplementation on feed efficiency in beef steers. Steers [n = 40; body weight (BW) = 492 ± 36 kg) underwent a 42-d trial in a 2 × 2 factorial arrangement, considering RFI classification and RBP supplementation. Liver tissue samples collected on d 42 were analyzed for mRNA expression of immune genes and mitochondrial protein complexes I to V. Regardless of RFI status, RBP increased blood urea nitrogen (BUN; P = 0.01), with decreased BUN in low-RFI beef steers. Interactions of RBP and RFI were observed (P ≤ 0.05) for mitochondrial activities of complexes IV, V, and mRNA expressions of immune genes (TLR2, TLR3, IL23A). While RBP did not impact growth performance, its effects on immune gene expression and mitochondrial protein complexes varied with RFI status, highlighting the importance of considering RFI status in future studies investigating the effects of dietary protein supplements effects in beef cattle.
189 Association of the liver phosphoproteome with divergent dry matter intake in finishing beef steers
Authors: King Mindy E , Newcomb Carlee M , Rathert-Williams Abigail R , Beck Matthew R , Hagen Darren E , Hartson Steven D , Foote Andrew P 
Published: September 2024

Abstract
As the need for improving the sustainability of the beef industry increases, optimizing feed efficiency is of the utmost importance. The liver has a central role in nutrient metabolism, and for ruminants particularly, it is essential for providing glucose through gluconeogenesis via substrates such as propionate, lactate, and glycerol. Further, through cell signaling and vagal afferent signals, the liver acts to stimulate and inhibit dry matter intake (DMI). Thus, the objective of this study was to investigate alterations in the phosphoproteome of finishing beef steers in relation to divergent DMI to identify changes in the abundance of signaling proteins. Angus steers [n = 57; initial body weight (BW) = 518 ± 27 kg] underwent a 63-d intake trial utilizing an Insentec Roughage Intake Control System (Hokofarm Group, Emmeloord, The Netherlands). Prior to beginning the trial, liver biopsy samples were collected from all steers. Samples from steers with the greatest and least DMI (n = 8 each) were utilized for phosphoproteomic analysis. Liver protein was isolated and labeled with isobaric tandem mass tagging reagents. Samples were enriched for phosphopeptides using immobilized metal affinity chromatography and subsequently analyzed using high-performance liquid chromatography tandem mass spectrometry. Spectral data were searched in the National Center for Biotechnology Information Bos taurus protein database using MaxQuant (version 2.2.0.0; Max Planck Inst., Munich, Germany), and the data were analyzed using Perseus (version 2.0.10.0; Max Planck Inst.). Two sample t-tests were conducted to determine the difference in phosphopeptide abundance between steers with high and low DMI. A total of 16,365 phosphopeptides were identified, and 287 were differentially expressed (False Discovery Rate &lt; 0.05). In addition, 2,777 phosphopeptides were differentially expressed based on an unadjusted P &lt; 0.05 which were used for enrichment analysis of Gene Ontology processes and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways using the Database for Annotation, Visualization, and Integrated Discovery. The background for this analysis was all identified phosphopeptides. Gene ontology terms enriched included processes related to phosphorylation activity, intracellular signal transduction, response to insulin, kinase activity, and signaling protein binding. Enriched KEGG pathways included pathways related to insulin signaling, such as AMPK signaling, mTOR signaling, and MAPK signaling. Further, pathways related to glycolysis and gluconeogenesis, glucagon signaling, insulin resistance, carbon metabolism, and various other signaling pathways were also enriched. These results suggest a link between the liver phosphoproteome and DMI, indicating that divergent DMI is associated with alterations in signaling pathways related to nutrient uptake and metabolic processes.
252 Evaluating the impact of inclusion of field pea (Pisum sativum) on rumen fermentation profile, production parameters, and composition of rumen bacterial community of dairy cattle
Authors: Alizadeh Arezoo , Derakhshani Hooman , Plaizier Jan Cornelis 
Published: September 2024

Abstract
Field peas (FP) are characterized by a crude protein (CP) content ranging from 24% to 28% of dry matter (DM). Approximately 78% of this protein is rumen degradable. Hence, FP can be a viable alternative protein source for livestock. We examined the effect of partially substituting corn-based concentrates with FP on production parameters, rumen fermentation profile, and the composition of the rumen bacterial community in lactating dairy cows. Lactating, non-pregnant Holstein cows (n = 12) were used in a repeated 3 × 3 Latin square with 21-d experimental periods, with the last 7 d used for sample and data collection. Cows were fed a basal TMR (control), or partially mixed diets to which 3.9% (LP), or 7.8% DM (HP) of FP were added. The control diet contained on a DM basis 17.4% CP, 4.5% crude fat, 28.0% starch, and an estimated 1.67 Mcal/kg of net energy for lactation (NEL). The FP contained 22.5% CP, 1.67% crude fat, 44.7% starch, and an estimated 1.81 Mcal NEL/kg. The rumen bacterial composition was analyzed by high-throughput sequencing of the V4 region of the 16S rRNA gene. Cows fed the HP diet had greater (P &lt; 0.05) ruminal ammonia (NH3-N), milk urea nitrogen (MUN), and plasma urea concentrations than those fed control and LP diets. Digestibility of DM was greater (P &lt; 0.05) for cows fed control and LP diets than for cows fed the HP diet. The CP total tract digestibility decreased (P &lt; 0.05) with increasing levels of peas in the diet. Compared with the control, the HP diet tended (P = 0.09) to increase the total ruminal concentration of branched-chain volatile fatty acids. The addition of FP to the diets did not affect the alpha diversity, as indicated by Shannon’s index, and the beta diversity of the rumen bacterial community [p(PERMANOVA) = 0.97]. However, the relative abundances of several bacterial taxa, including amplicon sequence variants (ASVs) belonging to Bacteroidia, Clostridia, and Gammaproteobacteria decreased in response to the addition of FP to the diet. Taken together, our results suggest that up to an inclusion rate of 7.8% DM, FP can be included in corn grain-based diets of lactating dairy cows without adverse effects on milk yield, milk composition, rumen fermentation characteristics, and rumen microbial composition.