RESEARCH PAPER

Establishment of Lactation Model Based on Meta-Analysis and Lactation Performance Prediction

  • LI Jinhui ,
  • CHEN Jiaxin ,
  • WANG Liyan ,
  • YANG Caihong ,
  • TIAN Xingzhe ,
  • TIAN Peizhi ,
  • YAN Hui ,
  • LIU Yueqin ,
  • JI Shoukun ,
  • ZHANG Yingjie
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  • College of Animal Science and Technology, Hebei Agricultural University, Baoding 071000, China

Received date: 2021-07-22

  Online published: 2022-02-15

Abstract

The milk yield of ewes is not only related to the nutritional requirement of ewes, but also an important factor affecting the growth and development of lambs. It is of great importance to accurately predict the milk yield of ewes in the balance nutrition of ewes and lambs. In this paper, Meta-analysis method was used to study the lactation curve model of ewes and lactation parameters, thus to predict the lactation performance. The related literatures related to ewe lactation curve were searched in the literature databases such as Web of Science and CNKI, and the parameters of lactation curve were screened and extracted according to the inclusion criteria. The Meta-analysis method was used to combine and comprehensively evaluate the lactation curve and its influencing factors of ewes. A total of 22 literatures were included and 87 groups of data were extracted. The results showed that the lactation curve model for goats was y=0.943 8t0.359 9e(-0.008 5t), for sheep was y=0.677 2t0.349 4e(-0.014 0t), for dairy goats was y=1.143 7t0.318 7e(-0.008 0t), for non-dairy goats was y=0.419 0t0.468 1e(-0.011 8t), for dairy sheep was y=0.796 8t0.256 2e(-0.009 0t) and for non-dairy sheep was y=0.570 0t0.441 0e(-0.026 0t). In the lactation curve models, y was y predicted milk yield (kg/d), t was days of milk (d), e was natural number (2.718 3). The model parameters was with high robustness (sensitivity<5%). The colostrum yield (milk yield at day 1 of postpartum) of goats, sheep, dairy goats, non-dairy goats, dairy sheep and non-dairy sheep was 0.94, 0.67, 1.13, 0.41, 0.79 and 0.55 kg, respectively; the peak lactation time was days 42.34, 25.00, 39.84, 39.67,28.47 and 16.96, respectively; the peak milk yield was 2.54, 1.47, 2.69, 1.47, 1.45 and 1.28 kg, respectively; and the lactation persistence was 6.48, 5.76, 6.37, 6.52, 5.92 and 5.26, respectively. The lactation curves of Wood models in goat, sheep, dairy goats, non-dairy goats, dairy sheep and non-dairy sheep are achieved based on Meta-analysis, and the lactation parameters of different types of ewes are obtained in this study, which provide basic information for nutrition balance in lactating ewes and pre-weaning lambs.

Cite this article

LI Jinhui , CHEN Jiaxin , WANG Liyan , YANG Caihong , TIAN Xingzhe , TIAN Peizhi , YAN Hui , LIU Yueqin , JI Shoukun , ZHANG Yingjie . Establishment of Lactation Model Based on Meta-Analysis and Lactation Performance Prediction[J]. Chinese Journal of Animal Nutrition, 2022 , 34(2) : 1343 -1351 . DOI: 10.3969/j.issn.1006-267x.2022.02.066

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