Serum progesterone levels in Pelibuey and Suffolk ewes under thermal stress
Por:
Mendoza, MR, Montaldo, HH, Sanchez, JAB, Ceron, JH
Publicada:
1 abr 2009
Categoría:
Veterinary (miscellaneous)
Resumen:
In this study it was assessed the effect of high environmental temperature on the serum progesterone levels and whether this effect is smaller in sheep (Pelibuey) adapted to hot climate than in not adapted sheep (Suffolk). Thirty two ewes, 16 of the Pelibuey breed and 16 of the Suffolk breed, were synchronized with intravaginal sponges with FGA. At day two of the estrous cycle (day of estrus = day 0), the ewes were assigned to two treatments: a) Thermal stress group [n = 16 (eight Pelibuey and eight Suffolk)]. From day two up to the return to estrus the ewes remained six hours a day in an environmental chamber at > 32 degrees C (35 +/- 1.4 degrees C) and 31% of relative humidity (RH); b) control group [n = 16 (eight Pelibuey and eight Suffolk)], stayed at ambient temperature during all the study (19 +/- 4 degrees C and 31% of RH). Two blood samples were taken daily (at 9:00 am and 4:00 pm) from day 0 until the following estrus. Progesterone was measured by radioimmunoassay. Progesteron
Filiaciones:
Mendoza, MR:
Univ Nacl Autonoma Mexico, Fac Med Vet & Zootecnia, Dept Reprod, Mexico City 04510, DF, Mexico
Montaldo, HH:
Univ Nacl Autonoma Mexico, Fac Med Vet & Zootecnia, Dept Genet & Bioestadist, Mexico City 04510, DF, Mexico
Sanchez, JAB:
Univ Nacl Autonoma Mexico, Fac Med Vet & Zootecnia, Dept Reprod, Mexico City 04510, DF, Mexico
Ceron, JH:
Univ Nacl Autonoma Mexico, Fac Med Vet & Zootecnia, Dept Reprod, Mexico City 04510, DF, Mexico
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