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Respective frequencies of early and late embryonic mortality in Prim’ Holstein cows under subtropical conditions

Published online by Cambridge University Press:  27 February 2018

E. Tillard ,
S. Nabeneza ,
B. Faye  and
P. Humblot
E. Tillard
Affiliation:
CIRAD EMVT, 7, Chemin Irat, Ligne Paradis, 97410 Saint-Pierre (He de La Réunion)
S. Nabeneza
Affiliation:
CIRAD EMVT, 7, Chemin Irat, Ligne Paradis, 97410 Saint-Pierre (He de La Réunion)
B. Faye
Affiliation:
CIRAD EMVT, BP 5035, Campus de Baillarguet, 34032 Montpellier Cédex 1 (France)
P. Humblot
Affiliation:
UNCEIA, Services Techniques, BP 65, 13 Rue Jouet, 94703 Maisons Alfort (France)
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Abstract

The frequency of early and late embryonic mortality was determined following 171 inseminations performed between January and December 1998 in 6 herds located in Reunion Island. Milk was sampled 23 to 24 days after Alfor progesterone determination in cows not observed to return to oestrus after AI. Cows were also blood sampled at between 30 and 45 days post-AI to measure Pregnancy Specific Protein B. Overall pregnancy rate was 25.1% (range between herds 12.5% to 42.3%). Early embryonic mortality or fertilisation failures and late embryonic mortality occurred in 57.3% (range between herds 52.9% to 61.6%) and 17.5% (range between herds 3.8% to 33.4%) of cows inseminated, respectively. Nonpregnant cows, not detected in oestrus by Day 24 after AI were recorded to returned to oestrus, on average 66 ±9.6 days or more than 3 cycles after AI. The pregnancy rate was depressed when cows were inseminated during the wet season compared with cows inseminated during the dry season. We conclude that fertilisation failures or early embryonic mortality was the main cause of reproductive failure in inseminated cows in tropical climates. The incidence was twice that obtained in studies conducted under more temperate climatic conditions.

Type
Posters
Information
BSAP Occasional Publication , Volume 26 , Issue 2: Fertility in the High-Producing Dairy Cow , September 2001 , pp. 389 - 392
Copyright
Copyright © British Society of Animal Science 2001

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