Effects of Different Zinc Sources on Growth Performance of Xiangdong Black Goat and Composition, Amino Acid and Fatty Acid Contents of Goat Milk

ZHENG Mengli, LI Siyuan, ZHANG Peihua, CHEN Dong, WANG Kaijun, YAN Qiongxian, ZHOU Chuanshe

doi:10.3969/j.issn.1006-267x.2018.10.022

2018 , Vol. 30 >Issue 10: 3976 - 3984

DOI: https://doi.org/10.3969/j.issn.1006-267x.2018.10.022

Molecular Nutrition

Effects of Different Zinc Sources on Growth Performance of Xiangdong Black Goat and Composition, Amino Acid and Fatty Acid Contents of Goat Milk

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1. College of Animal Science and Technology, Hunan Agricultural University, Changsha 410128, China;
2. Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production, Hunan Provincial Engineering Research Center for Healthy Livestock and Poultry Production, Scientific Observing and Experimental Station of Animal Nutrition and Feed Science in South-Central, Ministry of Agriculture, Changsha 410125, China;
3. Hunan Co-Innovation Center for Utilization of Botanical Functional Ingredients, Changsha 410128, China;
4. Hunan Co-Innovation Center of animal Production Safety, Changsha 410128, China

Received date: 2018-04-09

Online published: 2018-10-20

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Abstract

The aim of this trial was to investigate the effects of different zinc sources on growth performance of Xiangdong black goat and the composition, amino acid and fatty acid contents of goat milk. Twenty-one healthy Xiangdong black goats with twin pregnancy, similar parity and body weight (38.1±9.7) kg were randomly divided into 3 groups, and diets were a basal diet added with zinc sulfate (CON), methionine chelated zinc (Zn-Met) and glycine chelated zinc (Zn-Gly), respectively. The supplementation of zinc were all 40 mg/kg in groups. The pre-trial period was 7 days and the trial period was 42 days. During the trial period, pregnant ewes in those 3 groups were fed different zinc source diets and postpartum goats were fed diets without zinc addition. Milk samples were collected on day 15 after delivery. The results showed as follows:1) compared with CON group, total weight gain and average daily gain of pregnant ewes in Zn-Met and Zn-Gly groups were increased (P<0.05). 2) The somatic cell count, milk fat, milk protein, lactose, urea nitrogen, and non-fat dry matter contents of milk in Zn-Met and Zn-Gly groups were not significantly different (P>0.05), but the total dry matter content in Zn-Met group was significantly increased (P<0.05). 3) Compared with CON group, the amino acid contents in Zn-Met and Zn-Gly groups had no significant differences (P>0.05). 4) Compared with CON group, hexanoic acid, caprylic acid, lauric acid, tridecanoic acid, γ-linolenic acid contents in Zn-Met group were significantly increased (P<0.05), while wood wax acid, Cis-11-eicosenoic acid and γ-linolenic acid contents in the Zn-Gly group were significantly increased (P<0.05). In conclusion, Zn-Met can increase the total dry matter content in goat milk. Zn-Gly can increase the contents of monounsaturated fatty acids and polyunsaturated fatty acids in goat milk, and increase the total weight gain and average daily gain of pregnant ewes, indicating that supplemental Zn-Met and Zn-Gly can improve the growth performance of pregnant ewes and change the quality of goat milk.

Key words： zinc source; growth performance; goat milk; amino acid; fatty acid; Xiangdong black goat

Cite this article

ZHENG Mengli, LI Siyuan, ZHANG Peihua, CHEN Dong, WANG Kaijun, YAN Qiongxian, ZHOU Chuanshe . Effects of Different Zinc Sources on Growth Performance of Xiangdong Black Goat and Composition, Amino Acid and Fatty Acid Contents of Goat Milk[J]. Chinese Journal of Animal Nutrition, 2018 , 30(10) : 3976 -3984 . DOI: 10.3969/j.issn.1006-267x.2018.10.022

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