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Manipulation for out-of-season breeding in Spanish goats

T. Wuliji, A. L. Goetsch, A. Litherland, T. Sahlu, R. Puchala, and L. J. Dawson

E (Kika) de la Garza Institute for Goat Research, Langston University, Langston, OK

The manipulation of seasonal breeding in goats could improve profitability of meat goat production by producing out-of-season meat kids for Christmas festive markets and increasing the number of kids born per female. Therefore, the objective of this experiment was to evaluate means of manipulating breeding season. Three Spanish bucks were conditioned for 2 mo of long-day photoperiod (16 h light:8 h dark) starting January 19, 1999, followed by a single dose of a continuous-release melatonin implant (18 mg, Regulin, Schering Pty. Ltd). Eighty Spanish does (15 2 years of age and 65 yearling doelings) were allotted to three treatments of zero, melatonin implant, and oral administration of melatonin (Sigma Chemical Co., St. Louis, MO). Half of each melatonin group also received three pellets of bromocryptine mesylate (215 mg) implants (Innovative Research of America, Sarasota, FL). Therefore, treatments were: control (C), melatonin implant (MI), melatonin and bromocryptine mesylate implants (MIB), melatonin oral delivery (MO, 3 mg/d), and melatonin oral delivery and bromocryptine mesylate implant (MOB). At the end of treatments (April 13), does were randomized and bred in three single-sire groups for two estrus cycles (34 d). The number of does bred was 14, 14, 14, 14, and 15; number of does pregnant at ultrasonographic scanning was 5, 10, 12, 12, and 11; number of does kidded was 5, 10, 11, 8, and 8; and number of kids born was 8, 18, 18, 13, and 18 for C, MI, MIB, MO, and MOB, respectively. There was no difference among treatments in number of does bred, whereas melatonin-treated groups had a greater (P < .05) number of does that kidded and number of kids born. In conclusion, melatonin regardless of delivery mode increased the number of does kidding in the late summer/early fall.


 

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