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Growth of yearling meat goat doelings with changing plane of nutrition

R. Joemat1,2, A. L. Goetsch1, G. W. Horn2, T. Sahlu1, R. Puchala1, B.R. Min1, J. Luo1, and M. Smuts3

1E (Kika) de la Garza Institute for Goat Research, Langston University, Langston, OK
2Animal Science Department, Oklahoma State University, Stillwater, OK
3Centre for Animal Nutrition, Agriculture Research Council - Animal Nutrition and Products Institute, Irene, South Africa

Yearling meat goat doelings, 25 Boer × Spanish (BS) and 25 Spanish (S) (27 and 21 kg initial BW, respectively; SE = 0.6), were used in a 16-wk experiment to determine effects on growth of length of nutrient restriction and level of supplementation during realimentation. Doelings consumed prairie hay (6.2% CP, 70% NDF, and 9.1% ADL) ad libitum and received daily supplementation with 0.75% BW of concentrate (30% CP; C treatment), sequential 28-day periods of no supplementation and daily supplementation with 1.50 or 0.75% of concentrate (H-28 and L-28, respectively), or 56 days without supplementation followed by supplementation for 56 days with 1.50 or 0.75% of concentrate (H-56 and L-56, respectively). Ruminal ammonia N concentrations were below 6 mg/dL when concentrate was not supplemented. Body weight of S doelings was similar among dietary treatments throughout the experiment (d 28: 24.1, 24.1, 24.2, 24.6, and 23.8 kg, SE = 0.57; d 56: 24.2, 24.4, 24.0, 23.3, and 22.7 kg, SE = 0.67; d 84: 24.9, 25.3, 24.8, 25.1, and 24.6 kg, SE = 0.79; d 112: 25.2, 25.9, 26.3, 26.9, and 26.4 kg, SE = 0.81, for C, H-28, L-28, H-56, and L-56, respectively). Body weight of BS doelings also was similar among treatments on d 28 (26.2, 24.8, 23.8, 25.0, and 23.9 kg, SE = 0.57), but was greater (P < 0.05) for C vs L-28, H-56, and L-56 on d 56 (26.8, 25.7, 24.9, 23.2, and 21.3 kg, SE = 0.67), greatest among treatments (P < 0.05) for C on d 84 (29.4, 25.6, 25.2, 26.9, and 24.5 kg, SE = 0.79), and greater (P < 0.05) for C than for H-28, L-28, and L-56 on d 112 (31.3, 27.9, 27.5, 29.9, and 27.5 kg, SE = 0.81, for C, H-28, L-28, H-56, and L-56, respectively). In conclusion, maintaining an adequate plane of nutrition for steady growth and development appears more important for BS than for S yearling doelings, with the former possibly requiring longer periods of realimentation than previous nutrient restriction regardless of level of concentrate supplementation.


 

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