RESEARCH PAPER

A Study on Protein and Energy Requirements of Huaxi Cattle during Fattening Period

  • ZHANG Ying ,
  • WU Zhaohai ,
  • BU Dengpan
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  • 1. State Key Laboratory of Animal Nutrition, Institute of Animal Sciences of Chinese Academy of Agricultural Sciences, Beijing 100193, China;
    2. College of Animal Science and Technology, Qingdao Agricultural University, Qingdao 266109, China

Received date: 2022-05-12

  Online published: 2022-12-15

Abstract

This trial aimed to study protein and energy requirements of Huaxi cattle during fattening period, providing a theoretical basis for the breeding of Huaxi cattle. Seventy-five 12-month-old Huaxi bulls with similar physical condition were involved in the present study, and randomly assigned into 3 groups (25 bulls per group):ad libitum group (free feeding), 75% ad libitum group (75% feed intake of free feeding group of the previous day) and 50% ad libitum group (50% feed intake of free feeding group of the previous day). Unlimited access to fresh and clean water for cattle during 52-day feeding. Body weight of each cattle was weighted before and after feeding experiment, and the average daily gain (ADG) was calculated. After feeding experiment, 10 cattle from each group were randomly selected for a 5-day digestion metabolism experiment. Feces, urine and feed samples were collected and used for energy and protein determination, the metabolism parameters on energy (total energy intake, digestible energy, metabolic energy and methane energy) and protein (crude protein intake, digestible crude protein and deposited protein) were calculated, respectively. The regression equations for energy and protein requirements were developed based on the principle of factorization. The ADG of ad libitum group is 1.59 kg/d, which was much higher than the 0.61 kg/d in 75% of ad libitum intake group and -0.47 kg/d in the 50% of ad libitum intake group. The regression models of crude protein, digestible protein, digestible energy, and metabolic energy of Huaxi cattle in the fattening period were:CP=7.10W0.75+270.80ADG;DCP=4.36W0.75+127.10 ADG;DE=0.79W0.75+23.67ADG;ME=0.70W0.75+21.36ADG (CP was crude protein requirement, g/d; DCP was digestible crude protein requirement, g/d; DE was digestible energy requirement, MJ/d; ME was metabolic energy requirement, MJ/d; W0.75 was metabolic body weight, kg; ADG was average daily gain, kg/d). According to the regression model, the maintenance requirements of 12-month-old Huaxi bull (379 kg) were 67.85 MJ/d of digestible energy, 60.05 MJ/d of metabolic energy, 609.11 g/d of crude protein, and 374.04 g/d of digestible crude protein. The requirements for per kilogram of weight gain were 23.67 MJ of digestible energy, 21.36 MJ of metabolic energy, 270.80 g of crude protein and 127.10 g of digestible crude protein. This study provides a reference for the energy and protein requirements of Huaxi cattle during fattening period.

Cite this article

ZHANG Ying , WU Zhaohai , BU Dengpan . A Study on Protein and Energy Requirements of Huaxi Cattle during Fattening Period[J]. Chinese Journal of Animal Nutrition, 2022 , 34(12) : 7886 -7894 . DOI: 10.3969/j.issn.1006-267x.2022.12.038

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