Effect of Seasons and Management Practices on Reproductive Performance of Crossbred Cows Artificially Inseminated in Khartoum and Gezira States
Effect of Seasons and Management Practices on Reproductive Performance of Crossbred Cows Artificially Inseminated in Khartoum and Gezira States
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Date
2010
Authors
Hala Osman Alawad Mohammed
Journal Title
Journal ISSN
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Publisher
University of Khartoum
Abstract
This study was conducted to evaluate the effects of some
environmental factors and managemental practices on some reproductive
traits (calving interval (CI), day's open (DO) number of services per
conception (NSPC), and over all pregnancy rate (P.R).) of crossbred dairy
cattle artificially inseminated (AI) in Khartoum and Gezira states. Nineteen
farms were surveyed using structure questionnaire and data of 520
artificially inseminated cows for the period from January 2007 to
December 2008 was collected and screened. The data was classified into
three periods according to season of insemination (dry summer, wet
summer, and winter) and then subjected to statistical analysis by
(SAS,2004) program.
The results revealed that season of insemination exerted significant
effect on CI , DO and NSPC .Cows that were inseminated in dry summer
had the longest CI (466.16 days) and DO (185.96 days). The NSPC was
higher in dry summer 2.03; similar values were obtained in both winter and
wet summer. The parity number also secured significant (p<0.05) effect on
CI, DO and NSPC. The highest values of CI and DO were obtained in the
second parity 462.51and 182.40 days respectively, while the lowest values
were obtained for parity four 431.92 and 150.76 days respectively. The
highest values of NSPC were obtained in fifth parity 1.9 and the lowest in
parity one 1.7. The type of nutrition regime showed significant (p<0.05)
effect on CI, DO and NSPC. The highest values were obtained for those
farms with poor feeding regime 461.65 days, 180.89 days and 1.88
respectively. The inseminator techniques significantly (p<0.05) affected
CI, DO and NSPC. The location of the farm showed insignificant effect
(p>0.05) on CI and DO, while the NSPC was significantly affected by
location. Khartoum state obtained the higher value 1.8 and the lower value
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was recorded in Gezira state 1.6.The herd size and veterinary monitors
didn't show any significant (p>0.05) effect on the traits.
On the other hand location of the farm significantly (p<0.05)
affected number of cow serviced and number of cow receiving over one
service per conception, Khartoum state recorded the higher mean values
56.50 and 26.16 respectively, while the lower values were obtained in
Gezira state 13.38 and 3.38 respectively. Also the type of the farm
significantly (p<0.05) affected number of cow serviced and number of cow
receiving over one service per conception. Semi tradition scale farms had
the higher mean values 47.16 and 16.67 respectively, while the lower mean
values were obtained in traditional scale farms 17.69 and 7.76 respectively.
The over all pregnancy rate was insignificantly (p>0.05) affected by
location and type of farm.
The inefficiency in reproductive performance is caused by many factors,
however in the tropics, under nutrition plays a major role in depressing
reproduction .
Description
Athesis submitted to university of Khartoum in partial Fulfillment of Master of Science in dairy production And technology
Keywords
University of Khartoum
Seasons
Reproductive Performance of Crossbred Cows
Artificially Inseminated
Khartoum State
Gezira State
Citation
Hala Osman Alawad Mohammed, Effect of Seasons and Management Practices on Reproductive Performance of Crossbred Cows Artificially Inseminated in Khartoum and Gezira States .- Khartoum : University of Khartoum, 2010 .- 74p. : illus., 28cm., MS.c.