Progesterone and behavioral features when estrous is induced in Alpine goats.
The objective of the present study was to evaluate the endocrine and behavioral features of estrous-induced Alpine goats. A total of 36 nulliparous, 40 non-lactating and 42 lactating does were treated with intravaginal 60 mg medroxyprogesterone acetate sponges for 9 d plus 200 IU eCG and 22.5 microg d-cloprostenol 24 h before sponge removal. Plasma progesterone concentration was analyzed from blood sampled on days 0 (sponge insertion), 5, 8 (cloprostenol administration) and 9 (sponge removal) in 11 nulliparous, 13 non-lactating and 11 lactating does. Estrous response did not differ (P>0.05) among nulliparous (97.2%), non-lactating (90.00%) and lactating does (85.7%). Interval to estrus and duration of estrus did not differ (P>0.05) among nulliparous (22.8+/-9.9 and 25.6+/-6.8h), non-lactating (23.7+/-15.8 and 25.0+/-6.0 h) and lactating does (22.2+/-10.4 and 24.9+/-4.2h). The accumulative percentage of does in estrus during the first 36 h after sponge removal was 88.1%. The correlation between interval to estrus and duration of estrus was r=-0.32 (P<0.001). Endogenous progesterone production is decreased until day 8 or suppressed by MAP on day 9. Conception rate was greater (P<0.01) in lactating (77.8%) than non-lactating (44.4%) but similar (P>0.05) to nulliparous (60.0%) goats. Estrus can be efficiently induced by means of hormonal treatment in goats and acceptable fertility can be obtained regardless of animal category.
Fonseca
J F
JF
Embrapa Caprinos, CP D10, CEP 62011-970, Sobral, Ceará, Brazil. jeferson@cnpc.embrapa.br
Torres
C A A
CA
Santos
A D F
AD
Maffili
V V
VV
Amorim
L S
LS
Moraes
E A
EA
D000818:Animals; D003008:Cloprostenol / Q000494:pharmacology; D003271:Contraceptive Agents, Female / Q000494:pharmacology; D004971:Estrus / Q000187:drug effects / Q000502:physiology*; D005260:Female; D005306:Fertilization / Q000187:drug effects; D006041:Goats / Q000502:physiology*; D008186:Luteolytic Agents / Q000494:pharmacology; D008297:Male; D017258:Medroxyprogesterone Acetate / Q000494:pharmacology; D011247:Pregnancy; D018873:Pregnancy Rate; D011374:Progesterone / Q000097:blood*; D012726:Sexual Behavior, Animal / Q000187:drug effects / Q000502:physiology*; D013997:Time Factors
D003271:Contraceptive Agents, Female; D008186:Luteolytic Agents; D003008:Cloprostenol; D011374:Progesterone; D017258:Medroxyprogesterone Acetate