Feedlot growth performance and carcass characteristics of steers backgrounded on buffel grass or buffel-Desmanthus mixed pastures.

Autor:	Mwangi FW; Animal Genetics and Nutrition, Veterinary Sciences Discipline, College of Public Health, Medical and Veterinary Sciences, Division of Tropical Health and Medicine, James Cook University, Townsville, QLD, Australia., Savage D; North Australian Pastoral Company, Brisbane, QLD, Australia., Gardiner CP; Animal Genetics and Nutrition, Veterinary Sciences Discipline, College of Public Health, Medical and Veterinary Sciences, Division of Tropical Health and Medicine, James Cook University, Townsville, QLD, Australia., Charmley E; CSIRO Agriculture and Food, Private Mail Bag Aitkenvale, Australian Tropical Sciences and Innovation Precinct, James Cook University, Townsville, QLD, Australia., Malau-Aduli BS; College of Medicine and Dentistry, Division of Tropical Health and Medicine, James Cook University, Townsville, QLD, Australia., Kinobe RT; Animal Genetics and Nutrition, Veterinary Sciences Discipline, College of Public Health, Medical and Veterinary Sciences, Division of Tropical Health and Medicine, James Cook University, Townsville, QLD, Australia., Malau-Aduli AEO; Animal Genetics and Nutrition, Veterinary Sciences Discipline, College of Public Health, Medical and Veterinary Sciences, Division of Tropical Health and Medicine, James Cook University, Townsville, QLD, Australia.
Jazyk:	angličtina
Zdroj:	Frontiers in veterinary science [Front Vet Sci] 2022 Oct 04; Vol. 9, pp. 898325. Date of Electronic Publication: 2022 Oct 04 (Print Publication: 2022).
DOI:	10.3389/fvets.2022.898325
Abstrakt:	Feedlot performance and carcass characteristics of tropical beef steers backgrounded on buffel grass ( Cenchrus ciliaris ) only or buffel grass oversown with desmanthus ( Desmanthus spp. ; 11.5% initial sward botanical composition) were evaluated. It was hypothesized that tropical beef cattle steers backgrounded on buffel grass only or buffel grass oversown with desmanthus with similar backgrounding growth performance will not differ in feedlot growth performance and carcass quality. Three hundred and twelve Bos indicus × Bos taurus tropical composite steers, 20-23 months old and weighing 413 ± 24 kg, previously backgrounded on buffel grass only or buffel-desmanthus mixed pastures for 147 days were finished on a concentrate diet in the feedlot for 110 days before slaughter. Buffel-desmanthus backgrounded steers had a slightly higher average daily gain (ADG; 1.8 kg/day) than the buffel grass backgrounded steers that had 1.7 kg/day ADG ( p < 0.01). However, the final live weight and dry matter intake were not different ( p ≥ 0.59). All the carcass traits measured were not different ( p ≥ 0.18). Only 4% buffel grass and 8% buffel-desmanthus backgrounded steers fell short of the Meat Standards Australia (MSA) index, a level that is within the 4-9% reported for cattle produced in Queensland and slaughtered between July 2019 and June 2020. These findings indicate that desmanthus can be used to background beef cattle in northern Australia vertosol soil regions, where there is a paucity of adapted pasture legumes, with no negative impact on feedlot performance and carcass quality. The hypothesis that tropical beef cattle steers backgrounded on buffel grass only pastures or buffel grass oversown with desmanthus with similar backgrounding growth performance will have similar feedlot growth performance and carcass quality was accepted. Competing Interests: Author DS was employed by company North Australian Pastoral Company. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. (Copyright © 2022 Mwangi, Savage, Gardiner, Charmley, Malau-Aduli, Kinobe and Malau-Aduli.)
Databáze:	MEDLINE
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