Aim of the present study was to advance the reproductive activity in Sarda breed goats and to obtain lambing in Autumn, through melatonin administration in May. Two-hundred adult goats, aging between 3.8 and 7.6 years, with a BCS>2.5, were selected and subdivided into two groups (named M and C), each of 100 animals. Ten bucks were selected, and on April 25th they received 3 melatonin implants. On may 1st group M received 1 melatonin implant, while group C was untreated. On June 5th the male subjects were introduced in the female groups and removed 40 days after. From the 150° until to the 190° day after the introduction of the males, the kidding date and the number of new born were recorded. At the 150° day from the introduction of the males, group M showed a near double kidding rate compared to group C (P<0.05), while at the 190° day the two groups showed about the same kidding rate. The average in days from the introduction of the males to the parturition resulted lower in group M than in C. Data obtained, compared to data recorded in the previous two years, showed a shorter time (about 60 days) between the introduction of the males and kidding (P<0.01). In conclusion, melatonin administration produced an advance and a kidding concentration, compared to the previous two years. The lack of separation between treated and untreated animals produced a carry-over effect, reducing the differences among groups on fertility rate. This effect could be used to improve the reproductive efficiency in goats, with reduced costs of production.
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|Titolo:||Effetto del trattamento con impianti di melatonina sull’efficienza riproduttiva nella capra Sarda|
|Data di pubblicazione:||2013|
|Appare nelle tipologie:||1.1 Articolo in rivista|