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Supplementation of perennial cool season pastures with ruminally undegradable protein for spring kidding Angora does

S. P. Hart, M. R. Cameron, and T. Sahlu

E (Kika) de la Garza Institute for Goat Research, Langston University, Langston, OK.

Lactating Angora does have demonstrated increased milk and mohair production in response to increased dietary protein. The effects of feeding a ruminally undegraded protein (RUP) supplement on mohair production and kid and doe BW gain were studied in a 4 × 2 factorial arrangement replicated twice. Forages were wheat, 'Jose' tall wheatgrass, 'Paiute' orchardgrass,and 'KY 31' tall fescue pastures (0.3 ha). Forage availability was maintained at approximately 1,500 kg/ha by the put-and-take method using three does and their kids per pasture as testers. Grazing was initiated March 18 and terminated May 14 on wheat pastures and May 28 on other pastures. Does kidded March 20 to 25. Blood and ruminal fluid samples were obtained 3 and 6 wk post-kidding. Does received either 200 g/d of a corn-based supplement (8.8% CP) or 200 g of a corn-based supplement containing 20% Menhaden fishmeal (19.2% CP) as a source of RUP. Does grazing wheat pasture gained more (P < 0.05) BW than those grazing fescue with orchardgrass and wheatgrass being intermediate (P > 0.10; 45, -67,9, and -32 g/d, respectively; SE = 44). Kids on fescue pastures gained less weight than kids on other forages (123 vs 186 g/d; P < 0.05). Doe and kid BW gain, mohair production as well as blood metabolite concentrations were not affected by RUP. Blood urea N concentration was lower 6 wk post-kidding than at 3 wk (22.2 vs 17.8 mg/dL; P < 0.001). Milk urea N was greater for orchardgrass compared with other grasses 26 vs 21 mg/dL; P < 0.10) with blood urea N following a similar trend. Glucose and NEFA concentrations were greater (P < 0.001) at 6 wk post-kidding than at 3 wk (44.9 vs 51.8 mg/dL; 247 vs 339 Eq/L, respectively). The nutritive value of fescue was lower than for other cool season species tested. Supplementation of cool season forages with RUP did not improve BW gain or mohair production.


 

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