Estimation of carcass composition using rib dissection of calf-fed Holstein steers supplemented zilpaterol hydrochloride
| Autor: | N. D. May, John P Hutcheson, L. J. Walter, Ty E Lawrence, J.A. Reed, T. J. McEvers |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Male Trimethylsilyl Compounds animal diseases Ribs Body weight 03 medical and health sciences Animal science Proximate analysis Genetics Animals Dry matter Carcass composition Meat Science Holstein Chemistry Body Weight 0402 animal and dairy science Zilpaterol hydrochloride technology industry and agriculture zilpaterol food and beverages 04 agricultural and veterinary sciences General Medicine prediction 040201 dairy & animal science beef Animal Feed Red Meat 030104 developmental biology composition Dietary Supplements Body Composition Animal Science and Zoology Composition (visual arts) Cattle Food Science |
| Zdroj: | Journal of Animal Science |
| ISSN: | 1525-3163 0021-8812 |
| Popis: | A serial harvest was conducted every 28 d from 254 to 534 d on feed (DOF) to quantify changes in growth and composition of calf-fed Holstein steers (n = 115, initial body weight (BW) = 449.2 ± 19.9 kg). One-half were supplemented with the β-2 adrenergic agonist zilpaterol hydrochloride (ZH; 8.33 mg/kg 100% dry matter (DM) basis) during the final 20 d followed by a 3-d withdrawal prior to harvest; the remainder was fed a non-ZH control (CON) ration. Five steers were randomly selected and harvested after 226 DOF which served as a reference point for modeling purposes. Fabricated carcass soft tissue was ground, mixed, and subsampled for proximate analysis. Moreover, following the traditional method of rib dissection which includes the 9th, 10th, and 11th rib contained within the IMPS 103 primal, the relationship of carcass chemical composition to 9-10-11 rib composition was evaluated. Carcasses in this investigation had more (P < 0.01) separable lean, fat, ash, and moisture concomitant with less bone and ether extract than rib dissections. However, protein levels were similar (P = 0.27) between carcasses and rib dissections. Using regression procedures, models were constructed to describe the relationship of rib dissection (RD) composition including separable lean (RDSL), separable fat (RDSF), separable bone (RDSB), ether extract (RDEE), protein (RDP), moisture (RDM), and ash (RDA) with carcass composition. Carcass lean (CL), carcass fat (CF), and carcass bone (CB) were correlated (P < 0.01) with RDSL, RDSF, and RDSB with simple r values of 0.41, 0.71, and 0.50, respectively. Chemical composition of the rib and carcass, carcass ether extract (CEE), carcass protein (CP), carcass moisture (CM), and carcass ash (CA) were correlated (P ≤ 0.01) with simple r values of 0.75, 0.31, 0.66, and 0.37, respectively. Equations to predict carcass fatness from rib dissection variables and ZH supplementation status were only able to account for 50 and 56%, of the variability of CF and CEE, respectively. Overall, the relationships quantified and equations developed in this investigation do not support use of 9/10/11 rib dissection for estimation of carcass composition of calf-fed Holstein steers. |
| Databáze: | OpenAIRE |
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