Badillo BIA, Fernández RR, Ulloa AR

Language: English/Spanish
References: 18
Page: 63-66
PDF size: 42.92 Kb.

ABSTRACT

In order to evaluate the effects of the resorcinol acid lactone (zeranol) over the maturation of the chinchilla fur, an experiment was followed by grouping randomly by animals according to age and sex. The study lasted 4 months during the summer and fall (June-September). Thirty-three unmated females from 12 to 24 months, 60 males from 12 to 18 months, and 29 mature females from 24 to 48 months of age were included in the study. Half of the animals were subcutaneously implanted with 12 mg of zeranol. Every two weeks a visual evaluation was carried out, and the furs were obtained when the three fur color stripes were at the same level in all the body surface and when it was considered as a mature fur. A survival analysis according to the groups was performed by the Log Rank method, in which an important zeranol anagenic effect (P ‹ 0.01) was found. Implanted animals maturation percentage was of 84%, 94% and 50% on males, young and adult females, respectively; while for the others not under the treatment it was of 20%, 38% and 13.3% for the same groups, respectively. Two Log Rank analyses adjusted according to the groups showed both an age - and sex effect. In both cases, the young females presented a higher maturation percentage than the adult- and the male ones (P‹0.01).

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