Publications

Titles

English :

Factors affecting retention of placenta and its influence on postpartum reproductive performance and milk production in Friesian cows

Abstract

A total of 1243 records of 585 dairy Friesian cows collected through 8 years (1997-2004) were used to study factors affecting retention of placenta and its influence on reproductive performance and milk production. The obtained results showed that the percentage of retained placenta averaged 24.90%, the highest percentage was in the year 1998 (46.3%) and it increased significantly (P<0.05) with increasing body weight of cows, parity and body weight of calves born. The percentage of retained placenta was significantly higher (P<0.05) in spring and summer seasons (28.0 and 27.70%, respectively) and also with twining in comparison to single calving (37.90 vs. 24.20%, respectively). There were no significant differences in the percentage of retained placenta between winter and summer feeding as well as between male or female birthings. Retained placenta resulted in an increase (P<0.05) in the period from parturition to first estrus (25.90 vs. 20.50 days) and first service (56.90 vs. 47.20 days), service period (57.70 vs. 46.10 days), open days (106.90 vs. 92.70 days), number of services per conception (3.50 vs. 2.60) and calving intcrval (395.20 vs. 372.90 days). Moreover, it reduced the conception rate (66.70 V5. 74.10%) and average daily 111 ilk yield (13 vs. 14 kg) compared to normally calved cows. Key words: Friesian cows. retention of placenta. reproductive performance, milk production

Publication year

2010

Pages

6-12

Availability location

معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى- الجيزة

Availability number

Organization Name

Animal Production Research Institute (APRI)

serial title

Slovak Journal Animal Science

ISSN