It has been demonstrated that heat stress has a detrimental effect on conception rate of dairy cows, via early embryonic death. To reduce heat stress, providing shade, fan, appropriate diet and application of ovulation induction agents (GnRH and hCG) is recomended. Endogen PGF2a has positive effect on ovulation. Repeat Breader. The aim of the present study was to evaluate the role of PGF2a injection on reproductive performance of Repeat Breader (RB) dairy cows in heat stress condition at artificial insemenation (AI). This study was conducted in two large dairy farms in Tehran province during the summer 1386-87. All cows were inseminated (A M -PM) based on heat detection at 12 hours after observed standing heat. Mean temperature and humidity were recorded throughout the study. In this study 150 RB cows were randomly divided into three groups. Group A (n=50) received PGF2a simultaneously with AI, group B (n=50) received GnRH at the time of AI and group C (n=50) did not receive any treatment and served as control. Based on rectal palpation on 40-50 days of AI, 5 cows of group A, 9 of group B and 10 of group C were pregnant. There were not any significant differences among groups (p>0.05). The results revealed that simultanous using of PGF2a or GnRH with AI has no beneficial effects on conception rate in RB cows
vodjgani, M., Mosanan, A., Hasanlo, J., Gharagozlo, F., & Bahonar, A. (2010). EFFECT OF PGF2A INJECTION ON CONCEPTION RATE OF INSEMENATED REPEAT BREEDER COWS DURING SUMMER WARM CONDITION. Journal of Veterinary Research, 65(4), -.
MLA
mahdi vodjgani; Arash Mosanan; Jahanbakhsh Hasanlo; Faramarz Gharagozlo; Alireza Bahonar. "EFFECT OF PGF2A INJECTION ON CONCEPTION RATE OF INSEMENATED REPEAT BREEDER COWS DURING SUMMER WARM CONDITION". Journal of Veterinary Research, 65, 4, 2010, -.
HARVARD
vodjgani, M., Mosanan, A., Hasanlo, J., Gharagozlo, F., Bahonar, A. (2010). 'EFFECT OF PGF2A INJECTION ON CONCEPTION RATE OF INSEMENATED REPEAT BREEDER COWS DURING SUMMER WARM CONDITION', Journal of Veterinary Research, 65(4), pp. -.
VANCOUVER
vodjgani, M., Mosanan, A., Hasanlo, J., Gharagozlo, F., Bahonar, A. EFFECT OF PGF2A INJECTION ON CONCEPTION RATE OF INSEMENATED REPEAT BREEDER COWS DURING SUMMER WARM CONDITION. Journal of Veterinary Research, 2010; 65(4): -.
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