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Energy utilization by lactating Alpine goats: dietary concentrate level and stage of lactation

I. Tovar-Luna1, A. L. Goetsch1, R. Puchala1, T. Sahlu1, S. P. Hart1, and Z. B. Johnson2

1E (Kika) de la Garza American Institute for Goat Research, Langston University, Langston, OK, 2Department of Animal Science, University of Arkansas, Fayetteville

Twenty-four lactating and 13 nonlactating Alpine does were used to determine effects of stage of lactation and dietary concentrate level on energy utilization. Sixty and 20% concentrate diets (HE and LE, respectively) were consumed ad libitum by lactating does and at a level of intake near maintenance by nonlactating animals. Fecal and urine collections and respiration calorimetry were used to determine ME intake and energy expenditure. ME intake by lactating does was affected (P < 0.05) by an interaction between stage of lactation and diet (HE: 17.1, 20.0, and 17.9 MJ/d; LE: 17.9, 16.2, and 14.1 MJ/d for early, mid-, and late lactation, respectively (SE = 1.20)). Total milk energy yield decreased (P < 0.05) with advancing stage of lactation (7.04, 6.26, and 4.39 MJ/d for early, mid-, and late lactation, respectively; SE = 0.417) and was greater for HE vs LE (6.86 vs 4.94 MJ/d; SE = 0.509). Milk energy from the diet was similar between diets in early lactation but numerically greater in mid- and late lactation for HE than for LE (HE: 4.68, 6.31, and 5.02 MJ/d; LE: 4.88, 3.63, and 2.35 MJ/d for early, mid-, and late lactation, respectively (SE = 0.801)). The efficiency of ME utilization for maintenance based on data from nonlactating does was similar between diets and ranked (P < 0.05) mid- > early > late lactation (0.67, 0.71, and 0.61 for early, mid-, and late lactation, respectively; SE = 0.017). The efficiency of use of dietary ME for lactation (kl-d) was not influenced by stage of lactation and was greater (P < 0.05) for HE than for LE (0.63 vs 0.55; SE = 0.034). In conclusion, kl-d by lactating goats appears influenced by metabolizability of the diet similarly regardless of stage of lactation.


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