Effects of feeding ractopamine to physically castrated barrows, immunologically castrated barrows, and gilts on carcass characteristics, cutting yields, and fresh meat quality
| Autor: | B. K. Lowe, M. A. Tavárez, A. L. Schroeder, Anna C Dilger, Kellie A Kroscher, Floyd K. Mckeith |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
medicine.medical_specialty Marbled meat 0402 animal and dairy science food and beverages 04 agricultural and veterinary sciences Biology Loin 040201 dairy & animal science Surgery Ractopamine 03 medical and health sciences chemistry.chemical_compound 030104 developmental biology Carcass weight Animal science chemistry medicine Immunological castration Animal Science and Zoology Animal nutrition Carcass composition Food Science |
| Zdroj: | The Professional Animal Scientist. 32:346-356 |
| ISSN: | 1080-7446 |
| DOI: | 10.15232/pas.2015-01466 |
| Popis: | Ninety carcasses were used to evaluate the effects of feeding ractopamine (RAC) to gilts, physically castrated (PC) barrows, and immunologically castrated (IC) barrows. Finishing diets (0, 5, and 7.5 mg/kg RAC) were fed for the last 26 d before slaughter starting 7 d after the second dose of Improvest. Carcasses from IC barrows had less ( P P = 0.02) than PC carcasses but had more ( P ≤ 0.04) fat than gilt carcasses. Feeding RAC increased ( P = 0.03) bone-in carcass yields by 1.4 percentage units. Gilt and IC carcasses had 2.0 percentage units greater ( P P = 0.01) bone-in lean yields, and 1.5 percentage units greater ( P = 0.04) bone-in carcass yields than PC carcasses. Loin firmness, pH, and marbling were unaffected by sex and RAC feeding ( P ≥ 0.22). Bellies from IC carcasses were 0.3 cm thinner ( P ≤ 0.05) than PC but 0.3 cm thicker ( P ≤ 0.05) than gilts. Flop distances of IC bellies were similar to gilt bellies but reduced ( P ≤ 0.05) 13 cm compared with PC bellies. Iodine values of IC bellies were similar to PC bellies but reduced ( P ≤ 0.05) 3 units compared with gilts. Feeding RAC did not affect ( P ≥ 0.23) fresh belly characteristics. Overall, immunological castration and feeding RAC were additive in terms of improving carcass cutability but had only minimal effects on fresh pork loin or belly quality. |
| Databáze: | OpenAIRE |
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