Effects of Milking Frequency on Milk Production and Composition of Holstein Cows during Their First Three Lactations
محورهای موضوعی : Camel
1 - Department of Animal Production and Biotechnology, Hassan II Agronomy and Veterinary Medicine Institute, Madinate Al Irfane, 10 101, Rabat, Morocco
کلید واژه: milking frequency, dairy cows, milk composition, milk yield, parity and milking frequency interaction,
چکیده مقاله :
The objective of this study was to investigate the effect of milking frequency (two times daily vs. three times daily) on the 305-d lactation milk, fat and protein yield and fat and protein percentage of Holstein dairy cows in Morocco. Data analyzed were 31400 records collected between 2009 and 2016 on 14272 cows raised in 194 herds. The frequency of milking had significant effects (P<0.05) on 305-d milk, fat and protein yield as well as fat percentage. The milk, fat and protein yield and fat percentage were higher by 265.1 kg, 13.3 kg, 5.8 kg, and 0.3 g/kg, respectively, i.e. 3,79%, 4.78%, 2.40%, and 0.75%, respectively, for cows milked thrice than those milked twice daily. However, the frequency of milking did not influence protein percentage (P>0.05). The interaction between parity and milking frequency was not significant (P>0.05) for any studied trait. Based on the results of this study, it can be concluded that increasing milking frequency increased milk, fat and protein yield as well as fat percentage regardless of parity. However, the additional milk yield obtained might not compensate for the cost of the labor generated by the extra milking.
هدف از این مطالعه بررسی اثر دفعات شیردوشی (روزانه دوبار در مقابل روزانه سه بار) روی مقدار شیر، چربی و پروتئین دوره شیردهی 305 روزه و درصد چربی و پروتئین گاوهای شیری هلشتاین در مراکش بود. داده‌های آنالیز شده برای 31400 رکورد جمع‌آوری شده بین سال‌های 2009 و 2016 روی 14272 گاو پرورش داده شده در 194 گله بودند. دفعات شیردوشی اثرات معنی‌داری (5.05>P) روی مقدار شیر، چربی و پروتئین 305 روزه و همچنین درصد چربی داشت. مقدار شیر، چربی و پروتئین و درصد چربی به ترتیب با مقادیر 265.1، 13.3، 5.8 و 0.3 کیلوگرم، یعنی به ترتیب 3.19، 4.48، 2.40 و 0.75 درصد برای گاوهای سه بار دوشیده شده نسبت به آنهایی که روزانه دوبار دوشیده شده بودند بالاتر بود. اگرچه، دفعات دوشش درصد پروتئین را تحت تأثیر قرار نداد (0.05<P). اثر متقابل بین زایش و دفعات دوشش برای هر صفت مطالعه شده معنی‌دار نبود (0.05<P). براساس نتایج این مطالعه، می‌توان نتیجه گرفته شود که افزایش دفعات دوشش مقدار شیر، چربی و پروتئین و همچنین درصد چربی را بدون در نظر گرفتن زایش افزایش می‌دهد. اگرچه، مقدار شیر اضافی به دست آمده ممکن است هزینه کار ناشی از شیردوشی اضافی را جبران نکند.
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