Adding heat-treated rapeseed to the diet of yak improves growth performance and tenderness and nutritional quality of the meat.

TitleAdding heat-treated rapeseed to the diet of yak improves growth performance and tenderness and nutritional quality of the meat.
Publication TypeJournal Article
Year of Publication2019
AuthorsHao, L, Xiang, Y, Degen, A, Huang, Y, Niu, J, Sun, L, Chai, S, Zhou, J, Ding, L, Long, R, Liu, S
JournalAnim Sci J
Volume90
Issue9
Pagination1177-1184
Date Published2019 Sep
ISSN1740-0929
Abstract

Heat-treated rapeseed was supplemented to indoor fed yaks in winter to test the effect on dry matter intake (DMI), body mass change, and meat quality. Sixteen 3-year-old yak steers (124 ± 15.3 kg) were divided randomly into two groups and were offered either heat-treated rapeseed (HTR) or rapeseed meal (CONT). The yaks were allowed 14 days for adjustment and measurements were made over 120 d. There was no difference in DMI between groups (p = 0.67), but average daily gain tended to be higher (p < 0.056) and feed to gain ratio tended to be lower (p = 0.050) in HTR than in CONT yaks. Meat from HTR yaks was more tender (p = 0.006), had higher intramuscular fat (p = 0.013), and had lower cholesterol content (p = 0.009) than from CONT yaks. In addition, the atherogenic index was lower (0.37 vs. 0.43; p = 0.049), the PUFA:SFA ratio was higher (0.55 vs. 0.37; p = 0.049), and the n-6:n-3 (n-6 PUFA to n-3 PUFA) ratio was lower (2.76 vs. 4.78; p = 0.003) in HTR than in CONT yaks, which all favoured the HTR yaks. Meat from HTR yaks met human health standards of a PUFA:SFA ratio of above 0.4 and n-6:n-3 ratio of less than 4, whereas meat from CONT yaks just missed these standards.

DOI10.1111/asj.13266
Alternate JournalAnim. Sci. J.
PubMed ID31347239
Grant List2016YFD0500504 / / National Key Research and Development Program of China /
2018YFD0502300 / / National Key Research and Development Program of China /
31660673 / / National Natural Science Foundation of China /
2012CB722906 / / National Key Basic Research Development Earlier Stage Plan /
2013-Z-Y03 / / Qinghai Key Laboratory Platform Project /
2015DFG31870 / / International Cooperation Project of Ministry of Science and Technology /