Extensive management conditions do not modify the frequency of short ovulatory cycles in progesterone-treated does exposed to sexually active males

Most goats exposed to males in confined conditions have short ovulatory cycles. The frequency of these cycles can be reduced with a progesterone treatment prior to the introduction of males. The objective of this study was to determine whether extensive management conditions modify the frequency of...

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Bibliographic Details
Published in:Animal reproduction science 2018-12, Vol.199, p.40-44
Main Authors: Andrade-Esparza, J.D., Espinoza-Flores, L.A., Hernández, H., Chemineau, P., Keller, M., Delgadillo, J.A.
Format: Article
Language:English
Subjects:
Animal biology
Animals
Anovulation
Caprine
Female
Goats - physiology
Life Sciences
Male
Male effect
Ovulation
Ovulation Induction - methods
Photoperiod
Production systems
Progesterone - pharmacology
Reproductive Biology
Seasons
Sexual Behavior, Animal
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Summary:Most goats exposed to males in confined conditions have short ovulatory cycles. The frequency of these cycles can be reduced with a progesterone treatment prior to the introduction of males. The objective of this study was to determine whether extensive management conditions modify the frequency of short ovulatory cycles in progesterone-treated does exposed to photostimulated males. One group of does remained in extensive management conditions and grazed daily from 10:00 to 18:00 h; two other groups were confined separately in shaded pens, and fed alfalfa hay. In March, females from the grazing group (n = 45; grazing-P4 group) and those from one confined group (n = 45; confined-P4 group) were treated with 25 mg of progesterone by intra-muscular injections 48 h before joining with photostimulated males (n = 3 per group). The other confined group did not receive the progesterone treatment and was exposed to two photostimulated males (n = 25; confined-control group). Does were exposed to males for 45 consecutive days. Determination of whether ovulations occurre were made by quantifying plasma progesterone concentrations after introduction of males. The proportion of does that had ovulations at least once was not different between groups (≥98%; P > 0.05). The proportion of does that had short ovulatory cycles differed between groups (P 
ISSN:0378-4320
1873-2232
DOI:10.1016/j.anireprosci.2018.10.004