Effects of Restriction and Excess Amount of Fat-Soluble Vitamins on Slaughter Performance, Internal Organ Development and Meat Quality of Dorper&times;Thin-Tailed Han Crossbred Lambs during Fattening Stage

ZHOU Lixue, WANG Zhenyu, MA Tao, CUI Kai, YANG Dong, PAN Teng, WANG Wenyi, WANG Yunfei, CHEN Huaisen, DIAO Qiyu

doi:10.3969/j.issn.1006-267x.2019.05.025

2019 , Vol. 31 >Issue 5: 2176 - 2186

DOI: https://doi.org/10.3969/j.issn.1006-267x.2019.05.025

Molecular Nutrition

Effects of Restriction and Excess Amount of Fat-Soluble Vitamins on Slaughter Performance, Internal Organ Development and Meat Quality of Dorper×Thin-Tailed Han Crossbred Lambs during Fattening Stage

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1. College of Animal Science, Tarim University, Alar 843300, China;
2. Key Laboratory of Feed Biotechnology of Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
3. Institute of Agro-Food Science and Technology, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
4. Scientific Research Institute of Agricultural and Animal Husbandry in Bayanur, Bayanur 015000, China;
5. Inner Mongolia Fuchuan Feed Science and Technology Ltd., Co., Bayanur 015000, China

Received date: 2018-11-16

Online published: 2019-05-15

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Abstract

The purpose of this experiment was to investigate the effects of restriction and excess amount of fat-soluble vitamins (vitamin A, vitamin D and vitamin E) on slaughter performance, internal organ development and meat quality of Dorper×thin-tailed Han crossbred lambs during fattening stage, with an aim to evaluate if the recommendation of fat-soluble vitamins provided by NRC (2007) is suitable for the sheep production in China. A total of 120 Dorper×thin-tailed Han crossbred sheep (half male and half female) with average body weight of (26.00±0.11) kg after weaning at 90 days of age were used in the current study according to a single factor experimental design. All sheep were randomly divided into 5 groups according to their body weight with 12 replicates per group and 2 sheep per replicate (half male and half female). The control group (PC group) fed a basal diet which provided vitamin A, vitamin D and vitamin E compounds as required; 30% of vitamin A (PC-VA group), vitamin D (PC-VD group) and vitamin E (PC-VE group) was deducted from PC group in the experimental groups, respectively; a high-dose group (PC-7.5 group) was set up which all fat-soluble vitamins were 7.5 times higher than that of the control group. The experiment lasted for 100 days. The results showed as follows: 1) the eye muscle area of PV-7.5 group was tended to higher than that of PC group (P=0.06), there were no significant differences in live weight before slaughter (LWBS), carcass weight and dressing percentage of sheep among all groups (P>0.05). There were no significant differences in internal organ weights and their percentage of LWBS of sheep among all groups (P>0.05). There were no significant differences in each stomach weights and their percentage of total compound stomach weight of sheep among all groups (P>0.05). 2) The meat color brightness value of PC-7.5 group was significantly lower than that of the other groups except the PC group (P<0.05); the Longissimus dorsi C10:0 content of PC-VA group and PC-VE group was tended to lower than that of PC group (P=0.07), the Longissimus dorsi C20:0 content of PC-VA group and PC-VE group was tended to lower than that of PC-7.5 group (P=0.09); the Longissimus dorsi cystine content of PC group was significantly lower than that of other groups (P<0.05), and the Longissimus dorsi serine content of PC group was significantly lower than that of PC-VA group and PC-7.5 group (P<0.05). The results suggeste that deduction of 30% or excess amount of fat-soluble vitamins intake have no significant impact on slaughter performance and muscle fatty acid content of Dorper×thin-tailed Han crossbred sheep, however, it affects the muscle amino acid content, which have potential impacts on meat quality.

Key words： fat-soluble vitamins; slaughter performance; meat quality; fatty acid; amino acid; mutton sheep

Cite this article

ZHOU Lixue, WANG Zhenyu, MA Tao, CUI Kai, YANG Dong, PAN Teng, WANG Wenyi, WANG Yunfei, CHEN Huaisen, DIAO Qiyu . Effects of Restriction and Excess Amount of Fat-Soluble Vitamins on Slaughter Performance, Internal Organ Development and Meat Quality of Dorper×Thin-Tailed Han Crossbred Lambs during Fattening Stage[J]. Chinese Journal of Animal Nutrition, 2019 , 31(5) : 2176 -2186 . DOI: 10.3969/j.issn.1006-267x.2019.05.025

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