EFFECT OF REDUCING DOSE OF GNRH ANALOGUE USED IN HEAT-SYNCH PROGRAM ON PREGNANCY RATE AND DAYS OPEN OF DAIRY COWS

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BOLOURCHI M.; NIASARI NASLAJI A.; HOVARESHTI P.; SADEGHPOUR ROUSHANI E.

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Journal: Journal of Veterinary Research Year:2005 | Volume:60 | Issue:4 Page(s): 347-351

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Title

EFFECT OF REDUCING DOSE OF GNRH ANALOGUE USED IN HEAT-SYNCH PROGRAM ON PREGNANCY RATE AND DAYS OPEN OF DAIRY COWS

Author(s)

BOLOURCHI M. | NIASARI NASLAJI A. | HOVARESHTI P. | SADEGHPOUR ROUSHANI E. | Issue Writer Certificate

Keywords

HEAT-SYNCHQ4

GNRH ANALOGUE (LULIBERIN)Q4

HALF DOSEQ4

DAYS OPENQ3

PREGNANCY RATEQ2

Abstract

Objective: To reduce the cost of hormones used in Heatsynch protocol in dairy cows.Design: Experimental study.Animals: 144 Holstein cows, at 50 days postpartum.Cows randomly assigned into 3 groups: (1) 40 cows; 7.5µg luliberin, IM. (2) 45 cows; 15µg luliberin, IM. Seven days later in both groups, 150µg D-cloprostenol, IM 25 hours later Img Estradiol Benzoate was injected. Cows observed for 48 hours and inseminated based on standing heat. Cows that did not display estrus were inseminated at 48 hours after estradiol injection. (3) Control: group in=59, did not received any treatment and were inseminated 12 hours after displaying estrus. Pregnancy was diagnosed on day 42 after AI via rectal palpation.Statistical analysis: DAYS OPEN and PREGNANCY RATE were analyzed by One-way ANOVA and chi square tests, respectively.Results: The number of DAYS OPEN did not differ among experimental groups (group one: 104.17±7.76 days, group two: 106.28±6.24 days and the third group: 111.86±2.33 days (P>0.05). PREGNANCY RATE to the first service was not different among groups (group one: 47.5%, 19/40, group two: 48.88%, 22/45, third group: 32.20%, 19/59) (P>0.05).Conclusion: In conclusion, reducing the dose of GnRH analogue (Luliberin) to half of the full dose did not affect PREGNANCY RATE and DAYS OPEN. Therefore the cost of Heatsynch program can be reduced by using HALF DOSE of Luliberin.

Cites

مقایسه تاثیر تجویز 3 نوع GNRH در برنامه همزمانی Heat synch بر میزان آبستنی و میزان ترشح LH در گاوهای شیری

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APA: Copy

BOLOURCHI, M., NIASARI NASLAJI, A., HOVARESHTI, P., & SADEGHPOUR ROUSHANI, E.. (2005). EFFECT OF REDUCING DOSE OF GNRH ANALOGUE USED IN HEAT-SYNCH PROGRAM ON PREGNANCY RATE AND DAYS OPEN OF DAIRY COWS. JOURNAL OF VETERINARY RESEARCH, 60(4), 347-351. SID. https://sid.ir/paper/35035/en

Vancouver: Copy

BOLOURCHI M., NIASARI NASLAJI A., HOVARESHTI P., SADEGHPOUR ROUSHANI E.. EFFECT OF REDUCING DOSE OF GNRH ANALOGUE USED IN HEAT-SYNCH PROGRAM ON PREGNANCY RATE AND DAYS OPEN OF DAIRY COWS. JOURNAL OF VETERINARY RESEARCH[Internet]. 2005;60(4):347-351. Available from: https://sid.ir/paper/35035/en

IEEE: Copy

M. BOLOURCHI, A. NIASARI NASLAJI, P. HOVARESHTI, and E. SADEGHPOUR ROUSHANI, “EFFECT OF REDUCING DOSE OF GNRH ANALOGUE USED IN HEAT-SYNCH PROGRAM ON PREGNANCY RATE AND DAYS OPEN OF DAIRY COWS,” JOURNAL OF VETERINARY RESEARCH, vol. 60, no. 4, pp. 347–351, 2005, [Online]. Available: https://sid.ir/paper/35035/en

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