Studies on Productivities For Dairy Cows Under Different Grazing System and Grazing Intensity─2.Effect of Grazing on milk yields and weight gain

doi:10.11733/j.issn.1007-0435.1995.02.004

›› 1995, Vol. 3 ›› Issue (2): 112-119.DOI: 10.11733/j.issn.1007-0435.1995.02.004

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Studies on Productivities For Dairy Cows Under Different Grazing System and Grazing Intensity─2.Effect of Grazing on milk yields and weight gain

Yao Aixing, Wang Pei, Xia Jingxin, Fan Fencheng

Institute of Grassland Science, Beijing Agricultural University, Beijing 100094

Online:1995-05-15 Published:2012-07-11

不同放牧制度和强度下奶牛生产性能的研究──2.放牧对奶牛产奶量及体增重的影响

姚爱兴, 王培, 夏景新, 樊奋成

北京农业大学草地研究所, 北京 100094

基金资助:
国家“八五”攻关项目85-011-02-02

Abstract

Abstract: The effect of two grazing system (continuous grazing (CG) and rotational grazing (RG) and three grazing intensities(HGI(0.467 ha/cow), MGI(0.667 ha/cow), and LGI(0.867ha/cow)) on the milk yield, specific gravity and weight gain for Friesian cows grazed in mixed sward of perennial ryegrass(Lolium perenne) and white clover(Trifolium repens) were studied at Nanshan Ranch, Hunan Province.The total milk vields for RG cows during experimental period were significantly higher than that for CG cows (1632.5vs.1462.3 kg/cow).The total milk yields during experimental period were 1724.5, 1571.1 and 1331.2kg/cow for MGI, LGI and HGI respectively.There no significant differences in average daily gain (ADG) for cows between RG and CG(0.224 vs.0.205kg/cow.d).There were no significant ADG differences between LGI, MGI and HGI, the ADG was 0.242, 0.225 and 0.176kg/cow for LGI, MGI and HGI respectively.There was little difference in specific gravity of milk between different grazing treatments.It is indicated that grazing system and grazing intensity had significant effect on milk yield, though they had no effect on ADG and milk specific gravity.

Key words: Grazing system, Grazing intensity, Dairy cow, Milk yield, Weight gain

摘要： 本文作者在湖南南山牧场首次研究了不同放牧制度(分区轮牧和连续放牧)和放牧强度(0.467,0.667和0.867ha/头)下在多年生黑麦草/白三叶人工草地上放牧的黑白花奶牛产奶量、乳比重及体重的变化。结果表明:轮牧制奶牛的产奶量显著高于连续放牧制(1632.5vs.1462.3kg/头)。不同放牧强度下,奶牛的产奶量以中等放牧强度最高,轻牧次之,重牧最低,分别为1724.5、1571.1和1331.2kgh头。放牧期间两种放牧制间奶牛平均日增重差异不显著,以轮牧制较高(0.224vs.0.205kg/头·天);三种放牧强度间奶牛的平均日增重差异也不显著,由大到小依次为B3>B2>B1,分别为0.242、0.225和0.176kg/头·天。不同放牧处理对牛奶比重影响不大。这说明在本试验条件下,放牧制度和放牧强度对奶牛平均日增重增加影响不显著,但对奶牛的产奶量有显著的影响。

关键词: 放牧制度, 放牧强度, 奶牛, 产奶量, 体增重

Yao Aixing, Wang Pei, Xia Jingxin, Fan Fencheng. Studies on Productivities For Dairy Cows Under Different Grazing System and Grazing Intensity─2.Effect of Grazing on milk yields and weight gain[J]. , 1995, 3(2): 112-119.

姚爱兴, 王培, 夏景新, 樊奋成. 不同放牧制度和强度下奶牛生产性能的研究──2.放牧对奶牛产奶量及体增重的影响[J]. , 1995, 3(2): 112-119.

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Studies on Productivities For Dairy Cows Under Different Grazing System and Grazing Intensity─2.Effect of Grazing on milk yields and weight gain

不同放牧制度和强度下奶牛生产性能的研究──2.放牧对奶牛产奶量及体增重的影响

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