Abstract The objective of this study was to examine the differences in performance, feed efficiency, and greenhouse gas emissions Holstein heifers with divergent genomic residual intake (RFIg). (n = 55; initial BW 351 ± 64 kg) were classified as either low RFIg 29) or high 26) based on values determined from their breeding (Ecofeed index, STgenetics). Heifers blocked by RFIg, stratified assigne...

This study was conducted to determine the relative contribution of feeding behavior, DMI, apparent DM digestibility (DMD), and passage rate on variation in BW gain. One hundred forty-three crossbred steers were used in this study to determine the factors that contribute to variation in BW gain. Steers were 304 ± 1 d of age and had an initial BW of 338 ± 3 kg. Steers had ad libitum access to fee...

twenty-four 35-day-old lambs were distributed to a completely randomized design with 3 treatments to study the effects of number of feeding buckets per pen on performance, haematology and behaviour indicators. treatments consisted of 8 (t1), 4 (t2) or 2 (t3) feeding buckets/pen (8 lambs/pen). during the experiment, concentrate was fed at 08:30 in individual feeders. daily dry matter intake (dmi...

The objective of this study was to evaluate the effects of weaning age on dry matter intake (DMI), average daily gain (ADG), feed efficiency (FE), feed cost (FC) and benefit index (BI) of Holstein calves reared under organic farming system. Thirty two Holstein calves were divided into two treatments: early weaning (EW) vs. late weaning (LW). Calves in the both groups were provided with whole mi...

The objectives of the present study were 1) to evaluate the effects of supplemental fat and ME intake on plasma concentrations of glucagon-like peptide-1 (GLP-1), cholecystokinin (CCK), glucose-dependent insulinotropic polypeptide, ghrelin, and oxyntomodulin; and 2) to determine the association of these peptides with DMI and the hypothalamic concentration of mRNA for the following neuropeptides...

The aim of this study was to examine the effect age and dietary crude protein (CP) level on nitrogen (N) excretion in dairy heifers develop simple models predict N farm based nutrient intake parameters. Thirty-six Danish Holstein were divided into 4 groups; 8, 12, 16, 20 months old (M8, M12, M16, M20), respectively, with 9 animals per group. Heifers within groups blocked 3 according pregnancy s...

Macroalgae has gained increasing interest as antimethanogenic feed additives for cattle, but most in vivo studies are limited to investigating effects of the red macroalgae Asparagopsis spp. Hence, this study aimed investigate CH4 mitigating potential 3 brown from Northern hemisphere when fed dairy cows, and on intake, milk production, digestibility, animal health indicators. The experiment was...

Objectives were to evaluate the effect of feeding rumen-protected methionine (RPM) in pre- and postpartum total mix ration (TMR) on lactation performance plasma AA concentrations dairy cows. A 470 multiparous Holstein cows [235 at University Wisconsin (UW) 235 Cornell (CU)] enrolled approximately 4 wk before parturition, housed close-up dry cow replicated pens. Pens randomly assigned treatment ...

this study was performed to determine the effects of different levels of chromium methionine (cr-met)supplementation on growth performance, meat oxidative stability and ruminal metabolites in male kids. thirty-two male mahabadi goat kids, with an average initial body weight (bw) of 22 ± 2 kg at 4 months of age, were allocated in a completely randomized design with four treatments: control witho...

Seventy-four beef heifers were used to evaluate relationships among performance, residual feed intake (RFI), and temperament measured as growing heifers (Phase 1) and subsequently as 3-yr-old lactating beef cows (Phase 2) in the same cohort. In both phases, females were housed in a covered facility and fed similar forage-based diets, and individual feed intakes, BW, BCS, chute scores (CS), exit...