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The effects of two shipping treatments on the carcass characteristics of bulls implanted with zeranol and unimplanted steers.
J Anim Sci 1986; 62(6):1602-8JA

Abstract

A total of 144 male crossbred calves were allocated to four management treatments (bulls; steers; bulls implanted with zeranol at 100 d of age and re-implanted at 69, 93 and 56 d thereafter; bulls implanted with zeranol at 168 d of age and re-implanted at 93 and 56 d thereafter), and two pre-slaughter shipping treatments (minimum pre-slaughter stress with cattle shipped and slaughtered within 4 h of leaving the feedlot pen; moderate pre-slaughter stress with cattle mixed, trucked 160 km and slaughtered up to 24 h of leaving the feedlot pen) in a 4 X 2 factorial arrangement. Management treatment had no significant effect on carcass pH (45 min), carcass muscle temperature (45 min), or peak shear-force of cooked longissimus muscle. Steers had significantly lower dressing percentage, warm-carcass weight, hide weight and carcass-lean content, but higher marbling score, fat thickness and intramuscular-fat content than all treatments with bulls. Minimum pre-slaughter stress resulted in significantly lower dressing percentage, warm-carcass weight, and carcass pH (45 min), but generally had no effect on carcass tissue-yield measurements compared with the moderate stress treatment. Implanted bulls produced carcasses with significantly darker meat, higher 24-h pH and lower meat expressible juice than bulls and castrates for the moderate pre-slaughter stress treatment. These results provide evidence that zeranol implantation in bulls had a minor influence on carcass characteristics, and did not reduce the incidence of dark-cutting carcasses in young bulls subjected to moderate pre-slaughter shipping stress.

Authors

No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

3733559

Citation

Jones, S D., et al. "The Effects of Two Shipping Treatments On the Carcass Characteristics of Bulls Implanted With Zeranol and Unimplanted Steers." Journal of Animal Science, vol. 62, no. 6, 1986, pp. 1602-8.
Jones SD, Newman JA, Tong AK, et al. The effects of two shipping treatments on the carcass characteristics of bulls implanted with zeranol and unimplanted steers. J Anim Sci. 1986;62(6):1602-8.
Jones, S. D., Newman, J. A., Tong, A. K., Martin, A. H., & Robertson, W. M. (1986). The effects of two shipping treatments on the carcass characteristics of bulls implanted with zeranol and unimplanted steers. Journal of Animal Science, 62(6), pp. 1602-8.
Jones SD, et al. The Effects of Two Shipping Treatments On the Carcass Characteristics of Bulls Implanted With Zeranol and Unimplanted Steers. J Anim Sci. 1986;62(6):1602-8. PubMed PMID: 3733559.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The effects of two shipping treatments on the carcass characteristics of bulls implanted with zeranol and unimplanted steers. AU - Jones,S D, AU - Newman,J A, AU - Tong,A K, AU - Martin,A H, AU - Robertson,W M, PY - 1986/6/1/pubmed PY - 1986/6/1/medline PY - 1986/6/1/entrez SP - 1602 EP - 8 JF - Journal of animal science JO - J. Anim. Sci. VL - 62 IS - 6 N2 - A total of 144 male crossbred calves were allocated to four management treatments (bulls; steers; bulls implanted with zeranol at 100 d of age and re-implanted at 69, 93 and 56 d thereafter; bulls implanted with zeranol at 168 d of age and re-implanted at 93 and 56 d thereafter), and two pre-slaughter shipping treatments (minimum pre-slaughter stress with cattle shipped and slaughtered within 4 h of leaving the feedlot pen; moderate pre-slaughter stress with cattle mixed, trucked 160 km and slaughtered up to 24 h of leaving the feedlot pen) in a 4 X 2 factorial arrangement. Management treatment had no significant effect on carcass pH (45 min), carcass muscle temperature (45 min), or peak shear-force of cooked longissimus muscle. Steers had significantly lower dressing percentage, warm-carcass weight, hide weight and carcass-lean content, but higher marbling score, fat thickness and intramuscular-fat content than all treatments with bulls. Minimum pre-slaughter stress resulted in significantly lower dressing percentage, warm-carcass weight, and carcass pH (45 min), but generally had no effect on carcass tissue-yield measurements compared with the moderate stress treatment. Implanted bulls produced carcasses with significantly darker meat, higher 24-h pH and lower meat expressible juice than bulls and castrates for the moderate pre-slaughter stress treatment. These results provide evidence that zeranol implantation in bulls had a minor influence on carcass characteristics, and did not reduce the incidence of dark-cutting carcasses in young bulls subjected to moderate pre-slaughter shipping stress. SN - 0021-8812 UR - https://www.unboundmedicine.com/medline/citation/3733559/The_effects_of_two_shipping_treatments_on_the_carcass_characteristics_of_bulls_implanted_with_zeranol_and_unimplanted_steers_ L2 - https://academic.oup.com/jas/article-lookup/doi/10.2527/jas1986.6261602x DB - PRIME DP - Unbound Medicine ER -