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首页> 外文期刊>Tropical Animal Health and Production >Effect of varying dietary energy levels during the last trimester of pregnancy on subsequent first lactation performance in Sahiwal heifers
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Effect of varying dietary energy levels during the last trimester of pregnancy on subsequent first lactation performance in Sahiwal heifers

机译：妊娠后期三个不同饮食能量水平对Sahiwal小母牛随后第一次泌乳性能的影响

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摘要

The aim of the study was to determine optimum dietary energy level during the last trimester of pregnancy for Sahiwal heifers in subtropical Pakistan. Sixteen Sahiwal heifers, 5–6 months pregnant, were assigned to four dietary treatments with four heifers on each treatment. Isonitrogenous (CP = 14.1%) diets having varying energy, namely, ME 88%, ME 100% (Control), ME 112% and ME 124% of NRC recommended level for pregnant heifers, were fed until calving. All were fed a similar diet after calving. Precalving weight gain was highest (P < 0.05) in heifers fed ME 112 and 124% (486 ± 13 and 497 ± 5 g/day, respectively) followed by ME 100% (444 ± 7 g/day), and the lowest weight gain was recorded for ME 88% (397 ± 8 g/day). A similar trend was observed for feed efficiency. Body condition score at calving in groups ME 124% and ME 112% was higher than ME 88% and ME 100%. Nutrient digestibility, birth weight of calves and milk composition except fat content were not influenced by energy levels. The highest daily milk yield was observed in heifers fed ME 100% followed by ME 112, 124, and 88%. We conclude that the NRC recommendation is applicable to the subtropical region.
机译：这项研究的目的是确定亚热带巴基斯坦Sahiwal小母牛在怀孕最后三个月的最佳饮食能量水平。怀孕5-6个月的16个Sahiwal小母牛被分配到四种饮食疗法中，每种疗法中有四个小母牛。喂养具有不同能量的等氮（CP = 14.1％）日粮，即妊娠小母牛的NRC建议水平的ME 88％，ME 100％（对照），ME 112％和ME 124％。产犊后，所有人均接受相似的饮食。饲喂ME 112和124％（分别为486±13和497±5 g /天）的小母牛，产犊前体重增加最高（P <0.05），其次是ME 100％（444±7 g /天），并且体重最低记录到ME 88％（397±8 g /天）的增重。饲料效率也有类似趋势。 ME 124％和ME 112％组产犊时的身体状况评分高于ME 88％和ME 100％。营养物质的消化率，犊牛的出生体重和牛奶成分（脂肪含量除外）不受能量水平的影响。在饲喂ME 100％的小母牛中观察到最高的每日产奶量，其次是ME 112、124和88％。我们得出结论，NRC建议适用于亚热带地区。

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