Effects of night-locking on intake, digestion, behavior, and energy use by meat goat does grazing grass/legume pasture
I. Tovar-Luna, R. Puchala, T. A. Gipson, G. D. Detweiler, L. J. Dawson, T. Sahlu, A. Keli, A. L. GoetschJournal of Animal Science 89(E-Supplement 2):146. 2011
Boer × Spanish does (24), 8 with ruminal cannula, were confined at night with access to grass/legume pasture from 0700 to 1900 h (R) or had continual access (C) in a completely randomized design with repeated measures. Data collection periods (15 d) were in late gestation (L-G; 137 d), early lactation (E-L; 43 d), late lactation (L-L; 97 d), the dry period (Dry), and early gestation (L-G; 65 d). Most does had a litter size of 2, and kids were weaned at 118 d. Pasture access treatment did not affect ingesta composition; CP (20, 13, 15, 13, and 20%) and NDF (51, 59, 63, 61, and 38% in L-G, E-L, L-L, Dry, and E-G, respectively) varied among periods. Kid ADG tended (P<0.08) to be greater for C vs R (138 vs 118 g). Fat-corrected (4%) milk yield was greater (P<0.05) for C vs R in E-L but not L-L (2.04, 0.86, 3.27, and 1.23 kg/d for R/E-L, R/L-L, C/E-L, and C/L-L, respectively). Intake of ME was greater (P<0.05) for R vs C (823 vs 735 kJ/kg BW0.75). Treatment affected (P<0.05) time lying (12.4 and 10.5), grazing (4.5 and 5.8), and resting (18.5 and 16.7 h for R and C, respectively). Energy expenditure (EE) was greater (P<0.05) for C vs R (754 vs 687 kJ/kg BW0.75) and recovered energy (RE) in tissue gain was similar between treatments. The RE of lactation (REl) from dietary ME was greater (P<0.05) for C vs R (244 vs 194 kJ/kg BW0.75); however, REl from mobilized tissue differed between treatments (P<0.05) in E-L but not L-L (54, 15, 175, and 11 kJ/kg BW0.75 in L-G, E-L, L-L, Dry, and E-G, respectively). The EE of activity tended to be greater (P<0.07) for C vs R (243 vs 202 kJ/kg BW0.75). In conclusion, R decreased activity EE to an extent less than it lessened ME intake, and greatest R impact was in E-L, with reduced REl and a tendency for lower kid ADG.
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