نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار گروه علوم دامی دانشگاه زنجان
2 کارشناس ارشد جهاد کشاورزی
چکیده
تاثیر انرژی جیره در دوره خشکی بر تولید و ترکیب شیر گاوهای هلشتاین، با استفاده از 2143 راس گاو هلشتاین مطالعه شد. سه سطح از انرژی خالص شیردهی در دورهی دور از زایش و نزدیک به زایش، به ترتیب 55/1، 45/1، 35/1 و 65/1، 54/1، 44/1مطالعه شد. آمار توصیفی گلهها و گاوها گزارش شد. اثر انرژی جیرههای دور از زایش بر تولید و ترکیب شیر تا 120 روزگی معنیدار نبود ولی در کل دوره شیردهی، تولید شیر با افزایش غلظت انرژی جیره افزایش خطی داشت (05/0P <). اثر انرژی جیرههای نزدیک به زایش بر تولید و ترکیب شیر تا 120 روزگی معنیدار نبود ولی در کل دوره شیردهی با افزایش غلظت انرژی جیره نزدیک به زایش تولید شیر به طور خطی افزایش (05/0P <) و درصد چربی شیر کاهش یافت (05/0P <). با افزایش غلظت انرژی جیره های دور و نزدیک به زایش تعداد سلولهای بدنی افزایشی خطی نشان داد (01/0P <). نتایج این پژوهش نشان داد افزایش غلظت انرژی در دوره خشکی سبب افزایش تولید شیر و کاهش غلظت چربی شیر و افزایش تعداد سلولهای بدنی شد و تغییرات ترکیب شیر در کل دوره شیردهی مستقل از انرژی جیرهها در دوره خشکی بود و تابعی از مقدار تولید شیر در دوره شیردهی میباشد.
کلیدواژه‌ها
عنوان مقاله [English]
Effects of dietary energy density in the dry period on milk yield and content of Holstein cows
چکیده [English]
This study was conducted to investigate the effects of energy density in dry period on subsequent milk production. Milk production and milk components of 2143 milking cows were used and NEl of the far-off and close-up period’s diets were 1.35, 1.45, 1.55, and 1.44, 1.54, 1.65 Mcal/kg of dry matter. Descriptive statistics of herds were described. The results were showed as least square and standard error of means in early lactation (120 day) and whole lactation period. As energy density increased in the far-off and close-up periods, there was no difference in milk yield in early lactation period, but there was a linearly increase in whole lactation period (P < 0.05). Milk composition until 120 d didn’t changed with increasing energy density in the far-off diets, but milk fat percentage was linearly decreased (P < 0.05) in whole period by increasing dietary energy in far-off and until 120 d and whole lactation period (P < 0.05) by the close-up diets. There was a linearly increase in somatic cell count in early and whole period with increment energy density in the far-off and close-up diets. Generally, increasing energy density in dry period improved milk production and increased somatic cell count, and less milk fat content over lactation period might be independent of the dry period diet and it’s a function of length of lactation and milk amount.
کلیدواژه‌ها [English]
- Close-up
- Dry cow
- dry period
- Far-off
- Net energy for lactation
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