RUMINANT AND HERBIVORE NUTRITION AND FEED

Effects of Dietary Crude Protein Level on Performance, Nutrient Digestibility and Serum Biochemical Indexes of Yimeng Black Goats

  • CHENG Guangmin ,
  • CHEN Fengmei ,
  • FU Guihua ,
  • WANG Guangjing ,
  • YIN Zuoguo ,
  • XU Yaqiong ,
  • LIU Jiansheng ,
  • XU Xiangting
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  • 1. Shandong Vocational Animal Science and Veterinary College, Weifang 261061, China;
    2. Weifang Hanting District Animal Husbandry and Veterinary Office, Weifang 261011, China;
    3. Yinan County Longyin Manor Black Goat Breeding Professional Cooperatives, Linyi 276311, China

Received date: 2021-05-20

  Online published: 2021-12-16

Abstract

This experiment was conducted to study the effects of dietary crude protein level on performance, nutrient digestibility and serum biochemical indexes of Yimeng black goats, and to provide theoretical basis for determine the dietary crude protein level of Yimeng black goats during lactation. A total of 80 Yimeng black goats about to give birth with similar parity (2 to 3 parities), age (2 to 3 years old) and body weight[(29±3) kg] were randomly divided into 4 groups (groups A, B, C and D) with 5 replicates in each group and 4 goats in each replicate. They were fed experimental diets with crude protein levels of 14.15%, 15.34%, 16.27% and 17.47%, respectively. The day of ewe delivery was the beginning of the experiment, the lactation period (91 days) of ewes was divided into pre-lactation period (days 1 to 28), mid-lactation period (days 29 to 70) and late-lactation period (days 71 to 91). The results showed as follows:1) the dry matter intake (DMI) during pre-lactation period and mid-lactation period of groups C and D was significantly lower than that of group A (P<0.05). The crude protein intake (CPI) during pre-lactation period of group D was significantly higher than that of groups B and C (P<0.05), and the digestible crude protein intake (DCPI) during pre-lactation period of groups C and D was significantly higher than that of groups A and B (P<0.05). The CPI during mid-lactation period of group B was significantly higher than that of group C (P<0.05), and the DCPI during mid-lactation period of group A was significantly lower than that of other groups (P<0.05).The CPI during late-lactation period of group D was significantly higher than that of other groups (P<0.05), and the DCPI during late-lactation period of group A was significantly lower than that of other groups (P<0.05). 2) The body weight of ewes on day 70 and day 91 of group D was significantly higher than that of groups A and B (P<0.05). The litter weight of lambs on day 28, day 70 and day 91 of groups C and D was significantly higher than that of group A (P<0.05). 3) The milk yield of ewes during pre-lactation period, mid-lactation period and late-lactation period reached the maximum in groups D, C and B, respectively, and increased by 36.47%, 50.64% and 17.04% compared with group A (P<0.05), respectively. 4) The digestibility of crude protein, gross energy and dry matter during pre-lactation period and mid-lactation period of group C was significantly higher than that of group A (P<0.05), and the digestibility of crude protein, gross energy and dry matter during late-lactation period of groups B and C was significantly higher than that of group A (P<0.05). 5) The serum urea nitrogen content during pre-lactation period, mid-lactation period and late-lactation period of group D was significantly higher than that of group A (P<0.05). In conclusion, high dietary crude protein level will inhibit the DMI of Yimeng black goats, reduce the nutrient digestibility, and affect the DCPI in different lactation periods, thus affecting the milk yield of ewes and the growth rate of lambs. The appropriate dietary crude protein level is 16.27% to 17.47% during pre-lactation period, 16.27% during mid-lactation period and 16.27% to 17.47% during late-lactation period for Yimeng black goats.

Cite this article

CHENG Guangmin , CHEN Fengmei , FU Guihua , WANG Guangjing , YIN Zuoguo , XU Yaqiong , LIU Jiansheng , XU Xiangting . Effects of Dietary Crude Protein Level on Performance, Nutrient Digestibility and Serum Biochemical Indexes of Yimeng Black Goats[J]. Chinese Journal of Animal Nutrition, 2021 , 33(12) : 6889 -6898 . DOI: 10.3969/j.issn.1006-267x.2021.12.030

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