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An experiment was conducted to determine the effect of varying dietary supplemental inclusion levels of onion and garlic mixture on semen quality characteristics of Koekoek breeder cocks aged 35-41 weeks. The experimental diets were isocaloric and isonitrogenous but with different supplemental inclusion levels of onion and garlic. A complete randomized design was used for the experiment. The three dietary supplemental levels based on garlic and onion supplemental inclusion levels were Q0 (0 g onion and 0 g garlic per 600 g DM feed), Q1 (2.5 g onion and 2.5 g garlic per 600 g DM feed), and Q2 (5 g onion and 5 g garlic per 600 g DM feed) with each treatment having three replicates. A quadratic type equation was used to determine the onion and garlic levels for optimum semen quality characteristics. Daily supplementation with 5 g onion and 5 g garlic per 600 g DM feed increased progressive motile cells (%), actual life sperm count (×106/nl), and live sperm (%) by 221.20%, 301.51%, and 352.43%, while 2.5 g onion and 2.5 g garlic per 600 g DM feed reduced them by 28.67%, 12.69%, and 19.00%, respectively. However, daily supplementation with 2.5 g onion and 2.5 g garlic per 600 g DM feed increased sperm count (×106/nl) by 12.82%, whereas daily supplementation with 5 g onion and 5 g garlic per 600 g DM feed reduced it by 10.26% in Koekoek breeder cocks. Dietary onion and garlic supplemental inclusion levels of 3.009, 3.191, 4.621, 6.601, 6.719, 2.327, 2.385, and 2.247 g per 600 g DM feed supported optimum progressive motile cells (%), immotile sperm cells (%), actual dead sperm count (×106/nl), actual live sperm count (×106/nl), live sperm (%), acrosome morphology defects (%), acrosome detachment (%), and acrosome swelling (%), with probability values ranging from 0.003 to 0.783, whereas minimum progressive motile cells (%) increase was achieved at an optimum onion and garlic supplementation levels of 3.009 g per 600 g DM feed. These findings have a lot of implications on the use of supplemental onion and garlic inclusion levels to enhance reproductive efficiency in Koekoek breeder cocks

Semen quality characteristics of Koekoek breeder cocks influenced by supplemental inclusion levels of onion and garlic mixture at 35-41 weeks of age