E de la Garza Institute for Goat Research Langston University
Workshops & Field Day Newsletter Newsletter Subscription Demonstrations Demonstrations Langston University Research Building
Goat Menu
 

extension
extension
research
other
library
quiz
search
about
contact
faculty

bar

 

Effects of restricted feed intake on energy expenditure by different goat breeds

Helal, A., R. Puchala, G. Detweiler, T. Gipson, T. Sahlu, and A. Goetsch

Proceedings of the 10th International Conference on Goats. Number 102-4. International Goat Association. 2010

Sixteen Boer (B), Spanish (S), and 8 Angora goats (283, 316, and 330 d initial age, respectively) were used. During the first and second 10-wk phases, 8 animals of each breed were fed a 50% concentrate diet for maintenance and moderate energy accretion (C). Other animals were fed approximately 50% of these amounts in phase 1 relative to initial BW, followed by the higher level of feeding in phase 2 (R). ME intake was 4.47, 2.20, 4.84, 2.43, 4.14, and 2.06 MJ/d in phase 1 and 4.74, 4.09, 5.46, 4.67, 4.57, and 4.01 MJ/d in phase 2 for A-C, A-R, B-C, B-R, S-C, and S-R, respectively. ADG was 43, -20, 16, -78, 8, and -48 g in phase 1 (SE = 5.0) and 26, 44, 50, 65, 27, and 32 g in phase 2 (SE = 3.5) for A-C, A-R, B-C, B-R, S-C, and S-R, respectively. Clean mohair fiber growth by A was greater (P < 0.05) for C vs. R in phase 1 (6.70 vs. 5.33 g/d) and 2 (6.33 vs. 5.37 g/d). Energy expenditure (EE) for maintenance was greater for C vs. R in both phases (P < 0.05), greatest in phase 1 among breed intake treatments for A-C (P < 0.05), and greatest (P < 0.05) in phase 2 among breeds for A (481, 347, 430, 356, 424, and 338 kJ/kg BW0.75 in phase 1, and 494, 479, 445, 397, 444, and 406 kJ/kg BW0.75 in phase 2 for A-C, A-R, B-C, B-R, S-C, and S-R, respectively). Breeds on R differed in the temporal pattern of EE (kJ/kg BW0.75) expressed as a % of the wk-0 value: 95.8 (8.18 wk) + (0.655 wk2) (R2 = 0.58) for A, 95.3 (4.34 wk) + (0.271 wk2) (R2 = 0.41) for B, and 97.4 - (4.69 wk) + (0.282 wk2) (R2 = 0.53) for S in phase 1, and 78.9 + (8.74 wk) - (0.608 wk2) (R2 = 0.60) for A, 77.5 + (3.30 wk) - (0.153 wk2) (R2 = 0.39) for B, and 80.6 + (4.50 wk) - (0.208 wk2) (R2 = 0.43) for S in phase 2. In conclusion, nutrient restriction and realimentation elicited more rapid change in EE of greater magnitude with A vs. B and S. The pattern of decline in EE by B and S during restriction was similar, but the subsequent rise with realimentation was slower and smaller for B.


 

Extension Activities   |   Research Activities   |   Other Activities
Library Activities   |   Quiz   |   Search   |   About Us   |   Contact Us   |   Faculty & Staff
Research Extension Home   |   Top of Page

Copyright© 2000 Langston University   • Agricultural Research and Extension Programs
P.O. Box 730  • Langston, OK  73050 • Phone 405.466.3836