153 Phenotypic Selection of Efficient Beef Cows and Differences in Digestive Physiology

نویسندگان

چکیده

Abstract This study evaluated beef cows identified as having high or low efficiency when managed in extensive systems and whether they differ terms of digestive physiology. Nine (HE) (LE) were selected from a group 86 Angus using 2 years selection data. Yearly ranks assessed based on three weighted criteria: cow rump fat at calving; calving interval; calf weaning weight. The 18 then ruminally cannulated used to evaluate their response (HQ; 41.0±0.78% NDF), medium-high (MHQ; 56.9±1.17% moderate (MQ; 62.5±3.40% low-quality forage (LQ; 64.3±1.40% NDF) diets four consecutive 26-d periods where diet quality progressively decreased by period for all cows. There was no phenotype′diet interactions. Start end BW 48 45 kg less (P< 0.01) thicker HE than LE (P=0.02). Although total DMI did not (13.0 kg/d; P=0.93), (%BW) greater (2.12%) (1.97%, P< 0.01). Ruminal pH, short-chain fatty acid concentration, the molar proportion acetate, butyrate, propionate differ. digesta weight 4 (P=0.04) pool sizes DM (P=0.01), NDF (P=0.03) undigested HE. passage rate (3.11 vs. 2.89%/h, P=0.05), but there differences digestion. contraction amplitude (P=0.01) peak area higher Apparent tract nutrient digestibility (P≥0.23). Cows being efficient under an management system have BW, ruminal weight, digestibility.

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ژورنال

عنوان ژورنال: Journal of Animal Science

سال: 2022

ISSN: ['0021-8812', '1525-3163', '1525-3015', '1544-7847']

DOI: https://doi.org/10.1093/jas/skac247.141