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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2016.1
- 수록면
- 1 - 9 (9page)
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Background: The milk yield can be affected by the frequency of milking per day, in dairy cows. Previous studies have shown that the milk yield is increased by 6–25 % per lactation when the milking frequency is increased from 2 to 3 times per day while the somatic cell count is decreased. To investigate the effect of milking frequency (3X vs. 4X) on milk yield and it’s genetic parameters in the first and second lactations of the Iranian Holstein dairy cows, a total of 142,604 test day (TD) records of milk yield were measured on 20,762 cows.
Results: Heritability estimates of milk yield were 0.25 and 0.19 for 3X milking frequency and 0.34 and 0.26 for 4X milking frequency throughout the first and second lactations, respectively. Repeatability estimates of milk yield were 0.70 and 0.71 for 3X milking frequency and 0.76 and 0.77 for 4X milking frequency, respectively. In comparison with 3X milking frequency, the milk yield of the first and second lactations was increased by 11.6 and 12.2 %, respectively when 4X was used (p < 0.01).
Conclusions: Results of this research demonstrated that increasing milking frequency led to an increase in heritability and repeatability of milk yield. The current investigation provided clear evidences for the benefits of using 4X milking frequency instead of 3X in Iranian Holstein dairy cows.
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참고문헌 (35)
참고문헌 신청
Armstrong DV / 1997 / Milking frequency / Proceedings of the 3rd Western Dairy Management Conference :79~84
Biassus IO / 2011 / Genetic parameters for production traits in primiparous Holstein cows estimated by random regression / Revista Brasileira De Zootecnia 40:85~94
Bignardi AB / 2009 / Random regression models to estimate test-day milk yield genetic parameters Holstein cows in southeastern Brazil / Livest Pro Sci 123:1~7
Bignardi AB / 2009 / Parametric correlation functions to model the structure of permanent environmental (co)variances in milk yield random regression models / J Dairy Sci 92:4634~4640
Bohlouli M / 2012 / Estimation of genetic parameters of milk production traits of Iranian Holstein dairy cattle using multi-trait random regression model / Livest Res Rural Dev 24:11
Biassus IO / 2011 / Genetic parameters for production traits in primiparous Holstein cows estimated by random regression / Revista Brasileira De Zootecnia 40:85~94
Bignardi AB / 2009 / Random regression models to estimate test-day milk yield genetic parameters Holstein cows in southeastern Brazil / Livest Pro Sci 123:1~7
Bignardi AB / 2009 / Parametric correlation functions to model the structure of permanent environmental (co)variances in milk yield random regression models / J Dairy Sci 92:4634~4640
Bohlouli M / 2012 / Estimation of genetic parameters of milk production traits of Iranian Holstein dairy cattle using multi-trait random regression model / Livest Res Rural Dev 24:11
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