University of Khartoum

Astudy On The Effects Of Parity Order, Season & Period Of Calving On Reproductive And Productive Performance Of Holstain-Friesian Cows In Sudan

Astudy On The Effects Of Parity Order, Season & Period Of Calving On Reproductive And Productive Performance Of Holstain-Friesian Cows In Sudan

Show full item record

Title: Astudy On The Effects Of Parity Order, Season & Period Of Calving On Reproductive And Productive Performance Of Holstain-Friesian Cows In Sudan
Author: Magboul Mohamed, Mutaz Magboul Mohamed
Abstract: This study was conducted to examine the performance of Holstein- Friesian cows under Sudan conditions. The study covered the period from 1997–2005 and data collected from 528 reproductive and productive records of 54 cows. Age at first calving and first service were insignificantly (P>0.05) affected by parity number, season and period (3 years) of calving. They averaged 38.06±0.44 and 28.47±0.38 months, respectively. The calving interval was significantly (P<0.05) affected by parity number, season and period of calving, it averaged 14.91±3.76 months. The season of calving was significantly affected (P<0.05) by number of services per conception and secured an average of 2.57±0.12. Gestation length averaged 277.54±0.90 days and was insignificantly (P>0.05) affected by parity number, season and period of calving. The average percentage of first service conception rate was 23% (P<0.01). Milk yield in the first 100 days was significantly (P<0.05) affected by season and period of calving and it averaged 1443.85±47.09 liters. Whereas milk yield in the first 180 days was significantly (P<0.05) affected by period of calving and it averaged 2671.37±77.93 liters. Total milk yield was significantly (P<0.05) affected by parity number and period of calving, while it was insignificantly (P>0.05) influenced by season of calving. It averaged 4193.80±145.39 liters. Lactation length was significantly (P<0.05) affected by parity number, however, it was not affected (P>0.05) by season and period of calving, it averaged 304.39±7.73 days. Dry period was significantly (P<0.05) affected by season of calving and it averaged 130.73±7.21 days. The correlation coefficient between calving interval and total milk yield, dry period, age at first calving and first breeding were 0.29, -0.15, - 0.37 and -0.27, respectively. Whereas service period showed a significant correlation with number of services per conception, days to first service, first service conception rate, total milk yield, lactation length and dry period, they were 0.605, 0.16, 0.315, -0.355, 0.239, 0.451 and 0.417 respectively. However lactation length was positively correlated with dry period and number of services per conception (r = 0.198 and 0.133, respectively). Whereas age at first breeding was negatively correlated with first service conception rate (r = -0.578) and positively with number of services per conception (r = 0.909
Description: 105 Pages
URI: http://hdl.handle.net/123456789/8204
Date: 2015-04-03


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