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Boer, Kiko, and Spanish meat goats were semi-intensively managed in a complete 3-breed diallel mating scheme to evaluate genetic effects on preweaning kid performance. Over a 6-yr period, 1,547 kids were born in March and May with 1,173 kids raised by their dams to weaning at 3 mo of age. March-born kids were lighter (P &lt; 0.01) at birth, but had greater (P &lt; 0.01) preweaning ADG and survival rates and heavier (P &lt; 0.01) weaning weights than May-born kids. For birth weight, the direct Boer effect was positive (P &lt; 0.01) and direct effects were negative (P &lt; 0.01) for Kiko and Spanish. The direct Kiko effect for preweaning ADG was positive (P &lt; 0.05), whereas other direct breed effects for ADG and all direct effects for weaning weight did not differ from 0 (P &gt; 0.10). Maternal Boer effects were negative (P &lt; 0.01) for birth weight and weaning weight, whereas maternal Kiko effects were significantly (P &lt; 0.05) positive for preweaning ADG and weaning weight. Maternal Spanish effect was positive (P &lt; 0.05) for birth weight, but did not differ from 0 (P &gt; 0.5) for preweaning ADG or weaning weight. Heterosis for birth weight was exhibited (P &lt; 0.01) for each pair of breed crosses, but only between Boer and Kiko for ADG and weaning weight. Kiko and Spanish dams had greater (P &lt; 0.01) preweaning kid survival rates than Boer dams, but the former 2 did not differ (P = 0.72). Significant genetic variation was observed between meat goat breeds for kid performance to weaning. Maternal breed effects were more influential than direct breed effects. Boer goats were not superior to Kiko or Spanish for preweaning kid performance when semi-intensively managed on humid, subtropical pasture. Kiko should be a preferred breed and to a lesser extent Spanish for enhancing birth to weaning kid performance. Findings of this study emphasize the importance of proper doe breed selection in achieving desired kid performance to weaning in meat goats.

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Birth to weaning kid traits from a complete diallel of Boer, Kiko, and Spanish meat goat breeds semi-intensively managed on humid subtropical pasture1,2