Results 81 to 90 of about 201 (116)

Evaluation of Four Different Automated Activity Monitoring Systems to Identify Anovulatory Cows in Early Lactation. [PDF]

Animals (Basel)
Bretzinger LF, Hölper M, Tippenhauer CM, Plenio JL, Madureira A, Heuwieser W, Borchardt S.   +6 more
europepmc   +1 more source

Reproductive responses of primiparous and multiparous Holstein cows submitted to presynch-ovsynch protocol

Beni-Suef University Journal of Basic and Applied Sciences, 2017
The specific objective of this study was to determine the reproductive responses of primiparous (n = 446) and multiparous (n = 726) Holstein cows submitted to 12-day presynch-ovsynch protocol under the Egyptian circumstances. Distribution of inter-estrus
R.L. Abdel Aziz, A. Abdel-Wahab
exaly   +4 more sources

Fertility programs for lactating dairy cows: A novel presynch + timed artificial insemination program (Double E-Synch) produces similar ovarian dynamics, synchronization, and fertility as Double-Ovsynch

Journal of Dairy Science
: Fertility programs were implemented for the first postpartum timed artificial insemination (TAI) in 800 (primiparous and multiparous) lactating dairy cows, evaluating 2 presynchronization (presynch) strategies and 2 TAI protocols, in a 2 × 2 factorial ...
CARLOS E C Consentini, Milo C Wiltbank, Roberto Sartori   +2 more
exaly   +5 more sources

Effect of extending the interval from Presynch to initiation of Ovsynch in a Presynch-Ovsynch protocol on fertility of timed artificial insemination services in lactating dairy cows [PDF]

Journal of Dairy Science, 2016
The specific objective of this study was to determine if increasing the interval between the Presynch and Ovsynch portion of the Presynch-Ovsynch protocol (Presynch: PGF2α-14 d-PGF2α and Ovsynch: GnRH-7 d-PGF2α-56 h-GnRH-16-20 h-timed artificial insemination) from 12 to 14 d would reduce the fertility of lactating dairy cows not detected in estrus ...
J O Giordano, M D Curler, R Wijma
exaly   +3 more sources

Presynchronization with prostaglandin F2α and gonadotropin-releasing hormone simultaneously improved first-service pregnancy per artificial insemination in lactating Holstein cows compared with Presynch-14 when combined with detection of estrus

Journal of Dairy Science, 2023
: This study aimed to determine the effect of 2 simple breeding strategies combining artificial insemination (AI) after detection of estrus (AIED) and timed AI (TAI) on first-service fertility in lactating Holstein cows.
J P N Martins, T O Cunha
exaly   +3 more sources

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Benefits of using Double-Ovsynch versus presynch-ovsynch are affected by environmental heat in primiparous holstein lactating cows

Animal Reproduction Science, 2023
Optimized reproduction management enhances fertility of dairy cows, and thus improves their milk production efficiency. Comparing different synchronization protocols under variable ambient conditions would be conducive to protocol selection and production efficiency improvement.
Yao Xiao, Liguo Yang, Guohua Hua
exaly   +3 more sources

Effect of Sire Fertility and Timing of Artificial Insemination in a Presynch + Ovsynch Protocol on First-Service Pregnancy Rates [PDF]

Journal of Dairy Science, 2006
Sire fertility may influence pregnancy rate (PR) by differences in sperm survival in the female reproductive system and time required for capacitation and transport of sperm to site of fertilization. A predicted fertility index, Estimated Relative Conception Rate, was used to select 3 high-fertility artificial insemination (AI) sires (+3) and 3 average
M L Mcgilliard, R Kasimanickam, R L Nebel   +2 more
exaly   +3 more sources