Effect of ruminally protected methionine on body weight gain and growth of antlers in red deer (<Emphasis Type="Italic">Cervus elaphus</Emphasis>) in the humid tropics |
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| Authors: | Paula Mendoza-Nazar Germán David Mendoza-Martínez José Herrera-Haro Benigno Ruiz-Sesma Ricardo Bárcena-Gama Luis Tarango-Arámbula |
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| Institution: | Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma de Chiapas, Carretera Ejido Emiliano Zapata, Km. 8, Tuxtla Gutiérrez C.P. 29000, Chiapas, Mexico. |
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| Abstract: | Sixteen male red deer (Cervus elaphus), with an initial weight of 93.83 ± 4.38 kg were used to study the effect of the dietary level of ruminally protected methionine
(RPM) on growth, antler morphometry and serum metabolites. The deer were allowed to graze and were individually supplemented
with concentrate to provide 0, 2.5, 3.5 or 4.5 g/day of RPM for 65 days. There was a quadratic effect on daily weight gain
(0.163, 0.098, 0.147 and 0.172 kg/day; P < 0.005) and antler beam length (59.7, 63.6, 63.0 and 57.2 cm; P < 0.02) for RPM levels of 0 to 4.5 g/day, respectively. The brow tine length and the number of points were similar across
all treatments. Serum glutamic pyruvate transaminase (SGPT) was reduced (quadratic effect; P < 0.02; 22.0, 29.6, 18.0 and 17.8 IU/l) to RPM levels of 0 to 4.5 g/day, respectively, whereas other metabolites (glucose,
cholesterol, urea, creatinine, total protein and serum glutamic oxaloacetic transaminase SGOT]) were unchanged. Increasing
the RPM dose did not affect weight gain or antler growth. Methionine supplementation reduced the activity of SGPT. |
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