NDLI: Efficiency of two timed artificial insemination protocols in Murrah buffaloes managed under a semi-intensive system in the tropics.

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Efficiency of two timed artificial insemination protocols in Murrah buffaloes managed under a semi-intensive system in the tropics.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Oropeza, Armando José Rojas, Angel F. Velazquez, Miguel A. Muro, Juan D. Márquez, Ysabel C. Vilanova, Lourdes T.
Description	Country affiliation: Venezuela Author Affiliation: Oropeza AJ ( Departamento de Genética y Reproducción Animal, Universidad Centroccidental Lisandro Alvarado, Decanato de Ciencias Veterinarias, Barquisimeto, 3001, Venezuela. aoropeza@ucla.edu.ve)
Abstract	The objective of the study was to determine the efficiency of ovsynch (OV) versus presynch-ovsynch (P-OV) protocol for synchronization of ovulation and timed artificial insemination (TAI) in female buffaloes. The OV group (n = 40) received gonadotrophin-releasing hormone (GnRH) on day 0 (random day of the estrous cycle), prostaglandin PGF2 on day 7 and a second GnRH administration on day 9 followed by a single artificial insemination (AI) 16-20 h later. The P-OV group (n = 40) received two PGF2 injections 14 days apart, with the second injection administered 14 days before starting the OV protocol. Progesterone (P(4)) was measured at the time of PGF2 administration (within the OV protocol) and AI. Neither ovulation rate ((24 h after TAI) OV 90%-36/40 vs. P-OV 85%-34/40) nor pregnancy rates ((day 60 after TAI) OV 35%-14/40 vs. P-OV 45%-18/40) differed between the two protocols. Pregnant buffaloes had lower concentrations of P(4) at AI compared with non-pregnant animals in the OV group (0.7 +/- 0.1 vs. 1.1 +/- 0.1 ng/ml); but in the P-OV group, differences did not reach statistical significance (0.8 +/- 0.1 vs. 1.0 +/- 0.1 ng/ml). This apparent trend reached statistical significance when the analysis was carried out in animals from both protocols (0.7 +/- 0.1 (pregnant) vs. 1.1 +/- 0.1 (non-pregnant) ng/ml). In conclusion, both protocols synchronize ovulation effectively with no significant differences in conception rates. High concentrations of P(4) at AI seem to be detrimental for the establishment of pregnancy in lactating buffalo cows.
File Format	HTM / HTML
ISSN	00494747
Issue Number	6
Volume Number	42
e-ISSN	15737438
Journal	Tropical Animal Health and Production
Language	English
Publisher	Springer
Publisher Date	2010-08-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Veterinary Medicine Discipline Tropical Medicine Buffaloes Physiology Estrus Synchronization Methods Insemination, Artificial Veterinary Animals Female Gonadotropin-releasing Hormone Administration & Dosage Ovary Pregnancy Progesterone Blood Statistics, Nonparametric Tropical Climate Ultrasonography Evaluation Studies Journal Article
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology Food Animals

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Efficiency of two timed artificial insemination protocols in Murrah buffaloes managed under a semi-intensive system in the tropics

Gonadotropin-Releasing Hormone Increased Pregnancy in Suckled Beef Cows Not Detected in Estrus and Subjected to a Split-Time Artificial Insemination Program

Reproductive performance of dairy cows resynchronized after pregnancy diagnosis at 31 (±3 days) after artificial insemination (AI) compared with resynchronization at 31 (±3 days) after AI with pregnancy diagnosis at 38 (±3 days) after AI.

Efficacy of Ovsynch protocol in cyclic and acyclic Egyptian buffaloes in summer.

Pregnancy rates in angus cross beef cows bred at observed oestrus with or without second GnRH administration in fixed-time progesterone-supplemented Ovsynch and CO-Synch protocols.

Conception rates to fixed-time artificial insemination of two oestrus synchronisation programmes in dairy heifers.

ESTRUS SYNCHRONIZATION IN POSTPARTUM ANESTRUS MEHSANA BUFFALOES USING DIFFERENT HORMONE PROTOCOLS AND EARLY PREGNANCY DIAGNOSIS BY TRANSRECTAL ULTRASONOGRAPHY

Comparison of the effects of gonadotropin-releasing hormone, human chorionic gonadotropin or progesterone on pregnancy per artificial insemination in repeat-breeder dairy cows.

Risk factors for and reproductive outcomes of phantom cows on New Zealand dairy farms.

Efficiency of two timed artificial insemination protocols in Murrah buffaloes managed under a semi-intensive system in the tropics.

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Efficiency of two timed artificial insemination protocols in Murrah buffaloes managed under a semi-intensive system in the tropics

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Efficiency of two timed artificial insemination protocols in Murrah buffaloes managed under a semi-intensive system in the tropics.