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Animal Science Database

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Abstract

The objective of this study was to compare the effect of five estrous synchronization protocols on ovulatory follicle diameter, progesterone concentration at AI and days 5 and 12 after AI and conception rate in Holstein cows during heat stress. Holstein cows (n=250) with more than 30 kg/d milk...

Author(s)
Dirandeh, E.
Publisher
University of Tehran, Tehran, Iran
Citation
Iranian Journal of Animal Science (IJAS), 2018, 49, 1, pp Pe33-Pe41
Abstract

The aim of this study was to consider reproductive performance parameters and blood progesterone concentration changes in high-producing dairy cows (39±2 kg per day) after artificial insemination, in summer and winter. 270 heads of Holstein dairy cattle were choose in three big dairy farms, and...

Author(s)
Dashti, H.; Riasi, A.; Edris, M. A.; Gohrbani, G. R.; Omidi-Mirzaei, H.
Publisher
University of Tehran, Tehran, Iran
Citation
Iranian Journal of Animal Science (IJAS), 2016, 47, 2, pp Pe321-Pe327
Abstract

Specific structure of ewe's cervix is one of artificial insemination limitation in sheep. Successful insemination in ewes has a close relation with morphology of their cervix. The objective of this experiment was to compare anatomical structure of cervix in Makui, Kurdish and Afshari ewes. In this...

Author(s)
Soufyeh, K.; Rezaei, H.; Kohram, H.
Publisher
University of Tehran, Tehran, Iran
Citation
Iranian Journal of Animal Science (IJAS), 2015, 45, 4, pp Pe315-Pe323
AbstractFull Text

BACKGROUND: Use of different estrus synchronization protocols and artificial insemination methods made variations in fecundity of Iranian Zell ewes. OBJECTIVES: The purpose of the present study was to investigate pregnancy and lambing rates in Zell breed ewes following diverse progesterone...

Author(s)
Masoudi, R.; Towhidi, A.; Kermani Moakhar, H.; Zeinoaldini, S.; Hasanpour Bashi, S.
Publisher
Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
Citation
Journal of Veterinary Research, 2014, 69, 2, pp 133-139
Abstract

The aim of this study was to evaluate the effect of estradiol (E2), oxytocin (OT), relaxin (relaximol) injection and prostaglandin E1 (misoprostol) suppository on the cervix dilation, time of cervical dilation persistency and pregnancy rate of Zandi ewes using artificial insemination. Eighty 3-4...

Author(s)
Masoudi, R.; Zare-Shahneh, A.; Tohidi, A.; Kahram, H.; Sharif, A. A.; Sharafi, M.; Zahedi, V.
Publisher
University of Tehran, Tehran, Iran
Citation
Iranian Journal of Animal Science (IJAS), 2014, 45, 2, pp Pe125-Pe133
Abstract

The aim followed in the present study was to evaluate the effect of Estradiol (E2) injection and injection (either intramuscular (i.m) or intravenous (i.v)) of various doses of OxyTocin (OT) on cervix dilation and on conception rate in Zandi ewes during late breeding season. Sixty three ewes were...

Publisher
University of Tehran, Tehran, Iran
Citation
Iranian Journal of Animal Science (IJAS), 2013, 44, 3, pp Pe207-Pe215
AbstractFull Text

BACKGROUND: To improve breeding programs in dairy cattle artificial insemination using sexed sperm has been applied in different farms. OBJECTIVES: To evaluate pregnancy rate and economic benefit of artificial insemination with sexed sperm in Holstein dairy heifers of Shiraz industrial farms....

Author(s)
Chalmeh, A. A.; Ahmadi, M. H. N.; Tamadon, A.; Alipour, M.; Taghipour, Z.
Publisher
Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
Citation
Journal of Veterinary Research, 2012, 67, 4, pp 359-363
Abstract

This study was conducted to determine the effect of reducing the dosage of hormones used in the heat-synch protocol in dairy cows. 144 Holstein-Friesian at 50 days postpartum were randomly assigned to 3 groups. The first group (n=40) was administered 7.5 µg luliberin intramuscularly (i.m.). The...

Author(s)
Bolourchi, M.; Naslaji, A. N.; Hovareshti, P.; Roshani, E. S.
Publisher
Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
Citation
Journal of the Faculty of Veterinary Medicine, University of Tehran, 2005, 60, 4, pp 347-351

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