Factors Affecting Embryo Transfer Success in Recipient Heifers Under Field Conditions

Recipient age at transfer (less than 525 d old or more than 525 d old), season (fall, winter, spring, summer), method of synchronization (natural or induced), and transfer technique (surgical or nonsurgical transfer) were associated with success of embryo transfer in a log-linear analysis. In a sepa...

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Bibliographic Details
Published in:Journal of dairy science 1986-10, Vol.69 (10), p.2711-2717
Main Authors: Weaver, Leon D., Galland, John, Sosnik, Udi, Cowen, Peter
Format: Article
Language:English
Subjects:
ANALISIS ESTADISTICO
ANALYSE STATISTIQUE
Animals
Biological and medical sciences
Cattle - physiology
Early stages. Segmentation. Gastrulation. Neurulation
EMBRION
EMBRYO
Embryo Transfer - veterinary
Embryology: invertebrates and vertebrates. Teratology
EMBRYON
ESTACIONES DEL ANO
Female
Fundamental and applied biological sciences. Psychology
GENISSE
GESTACION
GESTATION
HEIFERS
METHODE
METHODS
METODOS
NOVILLA
PREGNANCY
Pregnancy, Animal
REPRODUCCION
REPRODUCTION
SAISON
SEASONS
STATISTICAL ANALYSIS
TRANSPLANTATION
TRASPLANTES
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Summary:Recipient age at transfer (less than 525 d old or more than 525 d old), season (fall, winter, spring, summer), method of synchronization (natural or induced), and transfer technique (surgical or nonsurgical transfer) were associated with success of embryo transfer in a log-linear analysis. In a separate analysis, no significant association was found between success of transfer and transfer to the left or right uterine horn. Summer had the lowest proportion of successful transfers (58.9%). Pregnancy rates were 83% using the surgical transfer method and 68% with transcervical transfers. Proportion of pregnancies following a second transfer was not different from the proportion after first transfers. Success of embryo transfer was highest if recipients were >525 d old and if transfers were performed surgically in spring following synchronization of recipients with cloprostenol, an analog of prostaglandin F2α. Probability of success was lowest for transfers to young, prostaglandin-synchronized recipients, performed non-surgically in summer.
ISSN:0022-0302
1525-3198
DOI:10.3168/jds.S0022-0302(86)80718-4