The objective of this study was to determine if body composition of developing gilts could be altered at the onset of estrus by ad libitum feeding diets differing in @entity4628 ( @entity4628 ) @entity376 and ME using levels that are within those used in practice by @entity1707 producers in the United States. Crossbred Large White * Landrace gilts ( = 1,221), housed in groups, were randomly allotted to 6 @entity4336 - @entity1460 diets in a 2 * 3 factorial arrangement formulated to provide 2 @entity4628 @entity376 and 3 ME levels. Gilts received grower diets formulated to provide 0.86 (low) or 1.02% (high) @entity4628 @entity376 and 2.94 (low), 3.25 (medium), or 3.57 (high) Mcal of ME/kg from 100 d of age until approximately 90 kg BW. Then, gilts were fed finisher diets containing 0.73 (low) or 0.85% (high) @entity4628 @entity376 and 2.94 (low), 3.26 (medium) or 3.59 (high) Mcal of ME/kg until 260 d of age. The medium @entity4628 @entity376 and medium-ME diets were based on an informal survey from the U.S. commercial @entity1707 industry to obtain average levels that are currently being formulated for developing gilts. Gilts were weighed and backfat thickness and loin area were recorded at the beginning of the trial and then every 28 d. @entity23093 ( @entity23093 ) was recorded as feed disappearance within the pen at 2-wk intervals. @entity376 (g) and ME (Mcal) consumed were calculated based on diet formulations. At approximately 260 d of age, gilts were slaughtered and warm carcass weight and fat thickness were recorded. There were no differences between @entity376 or ME levels for growth and body composition, except for backfat, which was slightly greater for gilts fed a high-ME diet. Gilts fed high-ME diets had a lower @entity23093 but a greater ME intake compared with gilts fed low ME ( < 0.05). Additionally, gilts fed the high-ME diet had lower @entity23093 and @entity376 intake per kilogram of BW gain when compared with gilts fed low- or medium-ME diets ( < 0.05). However, there was no difference in the megacalories consumed per kilogram of BW gain among treatments ( > 0.05). Carcasses from gilts fed the high-ME diet were 3.3 and 2.5 kg heavier than those from gilts fed the low- or medium-ME diets ( < 0.05). Despite significant differences in the @entity376 :ME ratio in the diets, no changes in growth or body composition occurred, likely due to compensatory changes in @entity23093 in response to dietary ME content. Caloric efficiency (Mcal to deposit 1 kg of BW) was similar among treatments.

Optimal dietary energy and amino acids for gilt development: Growth, body composition, XXXX , and carcass composition traits.

@entity1707 :: ('9823', 'Species') :: ['pig', 'swine'] @entity4628 :: ('MESH:D007077', 'Disease') :: ['SID', 'standard ileal digestible'] @entity4336 :: ('381124', 'Species') :: ['corn'] @entity23093 :: ('100322986(Tax:9823)', 'Gene') :: ['Feed intake', 'FI'] @entity376 :: ('CHEBI:25094', 'Chemical') :: ['Lysine', 'lysine'] @entity1460 :: ('3847', 'Species') :: ['soybean']
@entity23093 :: (100322986(Tax:9823),Gene) :: ['feed intake']
