REVIEW ON REPRODUCTIVE PERFORMANCES OF DAIRY COWS

M M R Howlader and M M Rahman
Journal of the Sylhet Agricultural University, Volume 4, Issue 1, 2017, Pages 27-34

Abstract:

This work was conducted to review the reproductive performance of dairy cows based on the reports published elsewhere. The overall least square mean of age at puberty of crossbred dairy cow ranged from 748.71±22.5 to 752±10.9 days, overall least square mean of number of services per conception (NSC) of crossbred dairy cattle ranged from 1.33±0.2 to 2.44±0.58. Similarly, the overall mean calving interval (CI) varied from 488 to 612±4.56 days as reported by different researchers in the different agro-ecology of the country in different times. The season and year of calving had its own influence on caving interval. The least square mean of age at first calving (AFC) of crossbred dairy cow ranged from 661±14 to 1059±198 days. The age at first service correlated with the age at puberty and it depends on to the different agro-ecology of the country in different time. The overall least square mean of age at first service varied from 588 to 752±10.9 days. The overall least square mean of postpartum heat period ranged from 74.5±1.6 to 114.5±73.00 days. The duration of estrus varies according to the season, breed etc. The overall least square mean of duration of estrus ranged from 5.1±1.1 to 34±0.85 hour. Generally the reproductive performance of crossbred dairy cow in different region and different agro-ecology are relatively better than the values reported for indigenous cattle breeds.

Keywords:

Puberty, first service, first calving, services per conception, calving interval, estrus duration, postpartum heat period, gestation period.


Full Text

PDF

751 Views


Cite this article

M M R Howlader and M M Rahman. 2017. REVIEW ON REPRODUCTIVE PERFORMANCES OF DAIRY COWS, Journal of the Sylhet Agricultural University 4(1): 27-34.