Effects of fertilization, leguminous trees, and supplementation on performance of meat goat does and their kids grazing grass/forb pastures
Goetsch, A. L., G. Detweiler, R. C. Merkel, T. A. Gipson, T. Sahlu, and G. E. AikenProfessional Animal Scientist 23:164-169. 2007
Thirty-nine Spanish does and their twin kids, approximately 4-wk old initially, were used in a 112-d experiment. Twelve grass/forb 0.4-ha pastures were subdivided into four paddocks and rotationally grazed for 2-wk periods in two 8-wk phases. Treatments were Control, Fertilization, Mimosa, and Supplementation, with three pastures per treatment. Three does with six kids grazed each of the Control, Supplementation, and Mimosa pastures, and four does with eight kids grazed Fertilization pastures. Fertilization pastures received a N, P, and K application 3 weeks before the experiment, and Supplementation animals received ad libitum access to a commercially available block containing 20% CP, with DM consumption averaging 116 g/d on a per doe basis. Mimosa leaf DM available at the beginning of each 2-wk period averaged 174 and 139 kg/ha in phase 1 and 2, respectively, although consumption was complete within the first few days of grazing periods. Fertilization increased prevalence of bermudagrass at the beginning of grazing periods (23.2, 43.6, 20.3, and 28.2% before grazing and 63.5, 58.9, 42.9, and 55.8% after the experiment for Control, Fertilization, Mimosa, and Supplementation, respectively; SE =5.70). Forage DM mass (excluding mimosa leaf DM) was similar among treatments (1,491, 1,554, 1,386, and 1,430 kg/ha; SE = 69.0); the concentration of CP in hand-plucked forage samples was 12.9, 14.7, 14.3, and 13.1% for Control, Fertilization, Mimosa, and Supplementation, respectively (SE = 1.12). Doe ADG was similar among treatments (-55, -56, -29, and -59 g/d; SE = 10.9), and kid ADG was greater (P < 0.05) for Mimosa vs. Supplementation (133, 130, 146, and 118 g/d Control, Fertilization, Mimosa, and Supplementation, respectively; SE = 5.8). In conclusion, a supplemental protein block may not be beneficial for grazing meat goat does with nursing twin kids unless forage is very low in protein. Fertilization can allow an increased stocking rate to elevate production per unit of land area. Leguminous trees in grass/forb pastures deserve further study as a means of nutrient supplementation, although methods of management to facilitate leaf availability throughout the grazing period or on most days should be given attention.
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