Luteal dynamics in goats: morphological and endocrine features

Revista Brasileira de Zootecnia

Eduardo Kenji Nunes Arashiro²  João Henrique Moreira Viana¹  Jeferson Ferreira Da Fonseca¹  Luiz Sérgio De Almeida Camargo¹  Carlos Antônio De Carvalho Fernandes¹  Felipe Zandonadi Brandão² 

[1] ,Universidade Federal FluminenseNiterói RJ ,Brasil

关键词: corpus luteum;    goats;    progesterone;    ultrasonography;    caprinos;    corpo lúteo;    progesterona;    ultrassonografia;   

DOI  :  10.1590/S1516-35982010000900011

来源: SciELO

【 摘 要 】

The aim of this study was to establish the morphologic and endocrine characteristics of luteal dynamics in goats. It was used Toggenburg female goats that showed natural estrus in a 48-hour interval. After estrus, ultrasonographic evaluations of the ovaries were daily performed during 21 days using a portable device (5MHz probe). Blood sample was collected for plasma progresterone (P4) determination. Corpora lutea were detected for the first time on day 5 and progressively increased in size until D9 (1.26 ± 0.08 cm²), with no variation on subsequent days. In females with one ovulation, the first visualization of the corpora lutea was earlier than in those with multiple ovulation (4.54 ± 0.18 vs 5.74 ± 0.25 days). At the moment of the first visualization, luteal area was smaller in animals with single ovulation. Plasma P4 concentration progressively increased until day 9 and it did not show significant increase until luteolysis, characterized by a sharp decrease in P4 concentration, reaching values below 1 ng/mL in 24 hours. The luteal area slowly and gradually decreased in size. It was observed a significant positive correlation between P4 concentration and area during luteogenesis and luteolysis (r = 0.63 and r = 0.50, respectively). When corpus luteum reached its maximum size (D9), female with more than one corpora lutea, with a greater luteal tissue area, did not show P4 concentration higher than those with one ovulation (5.92 ± 0.59 vs 7.04 ± 0.79 ng/mL). These results show that luteal dynamics in Toggenbur goats follow a similar pattern to those observed in other goat breeds and luteal tissue growth was positively correlated with corpora lutea functionality.

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