TY  - JOUR
T1  - Influence of Calving Season and Ambient Temperature on Anestrus Post Calving in Imported Holstein-Friesian Cows in Temperat Environment
AU - Al-Saffar, Kh. AU - N. Omran, Saleem Anas 
JO  - Journal of Animal and Veterinary Advances
VL  - 10
IS  - 4
SP  - 538
EP  - 544
PY  - 2011
DA  - 2001/08/19
SN  - 1680-5593
DO  - javaa.2011.538.544
UR  - https://makhillpublications.co/view-article.php?doi=javaa.2011.538.544
KW  - calving seasons
KW  -silent estrus
KW  -corpus luteum
KW  -ambient temperature
KW  -Anestrus post calving
KW  -Iraq
AB  - The objective of the present study was to determine the relationship between the incidence of anestrus post calving cows and the ambient temperature, months and calving seasons. This study was carried out on an imported dairy herd. The herd comprises of Holstein, Friesian crossbreeds. The results of the study indicated that a total percentage 49.36% of the cows suffering from delayed reestablishment of estrus till day 45 post calving while 33.19% were suffering from delayed estrus reestablishment till day 65 post calving. Meanwhile, the results of the study revealed an inverse relationship between the ambient temperature and the percentage of cows that showed a delayed in re-establishment of post calving estrus. According to seasonal classification, a higher percentage (66.3 and 47.28%) of anestrus cows post calving till day 45 and 65 post calving subsequently were recorded during winter whereas lower percentage (22.77 and 1.98%) subsequently were recorded during summer. The result of clinical examination (rectal palpation of ovaries) of 241 cows failed to exhibit estrus symptoms revealed that 64.73% of these cows were with group inactive ovaries (without corpus luteum) whereas 35.27% of these cows were with active ovaries (with corpora lutea), this of cows is recognized as cows with silent and unobserved estrus, statistical analysis of the data indicated that there is no relationship between the unobserved estrus (or silent estrus) with the ambient temperature. The results also showed that high percentage of anestrus post calving cows with inactive ovaries were recorded during winter and autumn (73.11 and 71.78%) subsequently whereas high percentage of anestrus post calving cows with active ovaries were recorded during summer.
ER  -