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As first phase in the development of feeding subsystems for bovines, based on the use of rice straw, a study on the effects of the level of suplementary protein and molasses on the response of steers was carried out under feed-lot conditions. Rice straw was administered ad libitum while the amounts of molasses, fishmeal and urea were varied. Using an incomplete 5 x 5 factorial arrangement (13 treatments) the levels of supplementary protein (X1) studied were: 0.0, 0.075, 0.150, 0.225 and 0.300 Kg/100 Kg liveweight/day; the molasses levels (X2) were: 0.0, 0.630, 1.250, 1.880 and 2.500 Kg as fed/100 Kg liveweight/day; 70% of the supplementary crude protein was provided by fishmeal and the rest by urea. Only those treatments with no supplementary protein caused losses in weight, although both variables affected this parameter in an exponential manner. the equation Y3= –0.394 + 8.406X1 + 0.412X2 – 17.417X21 – 0.106X22 + 0.187X1X2 (R2= 0.97, P<.01), describes combined effects of the supplementary crude protein (X1) and of the molasses (X2) upon weight gain (Y3) expressed in Kg/head/day. Molasses intakes negatively affected the intake of rice straw; in contrast, the protein improved it, as can be appreciated from the equation Y5= 4.78 + 6.72X1 – 1.65X2 – 10.71X21 + 0.23X22 + 1.04X1X2 (R2= 0.80, P<.01), where Y5= rice straw intake, Kg D.M./head/day. Both variables produced quadratic effects on the efficiency of feed conversion. The establishment of mathematical input-output relationships allows the calculation of the economic optimun levels of the variables studied depending on the costs of the inputs and selling price of the product.
| Main Authors: | , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Instituto de Innovación Agropecuaria de Panamá
1978
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| Online Access: | http://www.revistacienciaagropecuaria.ac.pa/index.php/ciencia-agropecuaria/article/view/578 |
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