Abstract

SALAS-REYES, Isela G. et al. Productive and economic response to partial replacement of cracked maize ears with ground maize or molasses in supplements for dual-purpose cows. Rev. mex. de cienc. pecuarias [online]. 2019, vol.10, n.2, pp.335-352. ISSN 2448-6698.  https://doi.org/10.22319/rmcp.v10i2.4569.

The aim of the study was to assess the effect of partial replacement of cracked maize ears with ground maize (GM) or sugar cane molasses (SCM) in supplements for dual purpose cows. Eighteen (18) multiparous cows (414 ± 13 kg of body weight and 106 ± 32 d in milk) were randomly assigned to the treatments. Treatments were as follows: 1) Control supplement (CS) which consisted of 87% of cracked maize ears (CME), 11% soybean meal, and 2% urea; 2) Ground maize replacing 20% of CME in CS (GMS); 3) Sugar cane molasses replacing 18% of CME in the CS (MOS). Each cow received 5 kg/d of supplement DM, whereas their calves received 1.8 kg/d DM of the CS. The experiment lasted eleven weeks, and data were recorded once at the end of every week. Data were analysed using a linear mixed model as a completely randomized design. Net profit from milk and beef due to supplements were estimated using the partial budget approach. There were no differences (P>0.05) between treatments on milk composition, body conditions score, nor daily weight gain of cows and calves. However, compared to GM, CS shown greater (9.0 %, P<0.05) dry matter intake and SCM shown greater milk yield (18.6 %, P<0.05). Partial replacement of cracked maize ears with ground maize or sugar cane molasses, in supplements for dual purpose cows, did not affected animal productive response. However, considered the combined net profit margins (milk and calves), SCM got an average of 9 % higher profits compared of the rest of supplements.

Keywords : Milk; Beef; Brown Swiss; Tropical Grasses; Energy supplementation.