University of Khartoum

Effect of Calving Season and Parity Order on some Reproductive Traits in the University of Khartoum Dairy Herd.

Effect of Calving Season and Parity Order on some Reproductive Traits in the University of Khartoum Dairy Herd.

Show full item record

Title: Effect of Calving Season and Parity Order on some Reproductive Traits in the University of Khartoum Dairy Herd.
Author: Mohammed Idris Ali, Salwa
Abstract: The objective of this study was to evaluate the effect of season of calving and parity order on calving interval, number of services per conception and days open. One hundred fifty reproductive records of 45 cross bred (Friesian- Kenana ) cows were chosen from the dairy herd of the University. of Khartoum . farm, located at Shambat, Khartoum North. The consulted records covered a period of five years (2005-2010) and six parities. The data pertaining to calving season and parity order were compiled and analyzed statistically to assess their impact on calving interval , days open and number of services per conception .The calving seasons were partioned to three groups of four months each: dry summer calving season (March –June) ,wet summer calving season (July –October) and winter calving season (Nov-Feb). The results indicated that neither the calving season nor the parity order and their interaction exerted any significant effect on calving interval .The overall mean of calving intervals was (428.6 days) .The parity order also did not influence the calving interval significantly . The longest calving interval (442.2 days) was recorded in the 4th parity, while the shortest calving interval (411.9 days) was recorded in the 5th parity .The interaction between calving season and parity order also demonstrated non significant effect on the calving interval. The parity order and season of calving did not affect days open. The overall means of days open was (149.2 days). 10 The longest days open (167.1 and 158.7days) were witnessed in the 6th and 4th parities, respectively. The shortest days open were recorded in the 3rd (134.1) and 5th (134.7) parities. The interaction between season of calving and parity order also did not show significant effect on days open.However, the season of calving exerted a significant effect on number of services per conception .The wet summer calvers recorded significantly high number of services of 2.02 compared with 1.59 and 1.44 service for dry summer and winter calvers. The parity order, on the other hand, exerted non significant effect on number of service per conception. Despite that, the 4th parity required the highest number of services to conceive .The interaction between calving season and parity order did not also affect number of services per conception. The overall means of number of services per conception was 1.67.
URI: http://khartoumspace.uofk.edu/handle/123456789/8694
Date: 2015-04-09


Files in this item

Files Size Format View

This item appears in the following Collection(s)

Show full item record

Share

Search DSpace


Browse

My Account