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Feed Intake and Growth by Spanish and Boer × Spanish Doelings Consuming Diets with Different Levels of Broiler Litter

T. Negesse1, R. C. Merkel2, A. Tolera1, A. L. Goetsch2, T. Sahlu2, R. Puchala2, T. A. Gipson2, and L. J. Dawson2

1Awassa College of Agriculture, Debub University, Awassa, Ethiopia, 2E (Kika) de la Garza Institute for Goat Research, Langston University, Langston, OK

Sixty Spanish (S) and 40 Boer × S (BS) doelings, 14.9 ± 3.8 and 21.9 ± 3.8 kg, respectively, were allocated to five treatments in an 84-d experiment (four 21-d periods) to test effects of dietary level of broiler litter (L) on feed intake and ADG. Six S and four BS doelings were assigned to two replicates per treatment. Treatments were OL: 20% chopped millet hay (H; 6.1% CP, DM basis) + 80% concentrate (11.9% CP); 20L: 20% H + 80% concentrate (12.9% CP) with 20% dietary L; 40L: 20% H + 80% concentrate (17.0% CP) with 40% dietary L; 60L: 20% H + 80% concentrate (21.0% CP) with 60% dietary L; and 80F: 80% H + 20% concentrate (24.4% CP). Diets were consumed ad libitum, group feed intake was determined daily, and BW was measured at 21-d intervals. DMI differed (P < 0.05) among all treatments in period 1 (772, 620, 683, 371, and 468 g/d; SE = 12.6) and 2 (816, 657, 748, 347, and 579 g/d; SE = 11.1) for 0L, 20L, 40L, 60L, and 80F, respectively. Goats consuming 0L had greatest and 60L lowest (P < 0.05) DMI in period 3 (938, 825, 859, 557, and 832 g/d; SE = 15.9) while in period 4, DMI was greatest for 0L and 40L and lowest (P < 0.05) for 60L (1,007, 933, 1,007, 682, and 905 g/d; SE = 19.9) for 0L, 20L, 40L, 60L, and 80F, respectively. ADG was similar between S and BS with 60L but greater (P < 0.05) for BS with other diets, and the difference between genotypes in ADG was greatest among treatments with 0L (interaction, P < 0.05). ADG of S was 108, 81, 71, 9, and 37 g/d (SE = 8.7), and that of BS was 177, 118, 105, 12, and 58 g/d (SE = 10.6) for 0L, 20L, 40L, 60L, and 80F, respectively. In conclusion, S and BS doelings can be fed diets with up to 40% L for growth comparable to or greater than that with a low quality forage-based diet, and diets with moderate to high levels of L or based on low quality forage may lessen differences in ADG between S and BS compared with concentrate-based diets.


 

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