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	Springer Nature Link
Author	Oropeza, Armando José Rojas, Ángel F. Velazquez, Miguel A. Muro, Juan D. Márquez, Ysabel C. Vilava, Lourdes T.
Copyright Year	2010
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 $$ \left( {{\hbox{PG}}{{\hbox{F}}_{2\alpha }}} \right) $$ 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 $$ {\hbox{PG}}{{\hbox{F}}_{2\alpha }} $$ 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 $$ {\hbox{PG}}{{\hbox{F}}_{2\alpha }} $$ 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.
Starting Page	1149
Ending Page	1154
Page Count	6
File Format	PDF
ISSN	00494747
Journal	Tropical Animal Health and Production
Volume Number	42
Issue Number	6
e-ISSN	15737438
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-04-02
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ovsynch Presynch-ovsynch Lactating buffaloes Tropics Veterinary Medicine Zoology
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology Food Animals

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