Resumo

GUTIERREZ-GONZALEZ, Delfín et al. Effect of different proportions of Moringa oleifera: Cenchrus purpureus on voluntary intake and nitrogen balance. Pastos y Forrajes [online]. 2018, vol.41, n.3, pp. 227-232. ISSN 2078-8452.

Four male goats of the Alpine breed, two years old and 37,94 ± 4,87 kg of LW, were used, confined in individual metabolism cages during 60 days and distributed in a Latin square design (4 x 4), in order to evaluate the effect of different proportions of Moringa oleifera:Cenchrus purpureus cv. Cuba OM-22 on the voluntary intake and nitrogen balance. The treatments consisted in the inclusion of increasing levels of M. oleifera (0, 20, 40, 80 %) in substitution of C. purpureus cv. Cuba OM-22 (100, 80, 60, 20 %), and a control to which concentrate feed (6 g kg LW^-1) and forage from cv. Cuba OM-22 ad libitum were offered. The results of dry matter intake relative to live weight (3,5 % LW, p < 0,0001), metabolic weight (88,99 g kg LW^0,75, p < 0,0004) and protein intake (220 g d^-1, p < 0,0001) benefitted the ration 80:20 % M. oleifera:C. purpureus. Similar statistical performance was shown by the ingested nitrogen (35,20 g day^-1, p < 0,0001), retained nitrogen (19,78 g day^-1, p < 0,0001) and apparent nitrogen digestibility (92,31 %, p < 0,0001). It is concluded that the utilization of rations with inclusion of M. oleifera:C. purpureus cv. Cuba OM-22 in goat feeding improves voluntary intake and nitrogen utilization, although the best performance was achieved with 80 % of M. oleifera:20 % of C. purpureus; which increased digestibility and retention, and it also decreased the nitrogen excretion to the environment.

Palavras-chave : goats; digestibility; nitrogen retention.

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