Milheto-grão (Pennisetum glaucum (L.) R.Br.) como substituto do milho em rações para poedeiras comerciais

Abstract

Avaliaram-se o desempenho produtivo e a qualidade dos ovos de poedeiras comerciais alimentadas com milheto como substituto do milho em rações de postura. Duzentas poedeiras comerciais, da linhagem LSL Lohmann branca, com 30 semanas de idade, receberam rações com níveis crescentes de substituição da energia metabolizável fornecida pelo milho por milheto. As aves foram distribuídas em um delineamento inteiramente ao acaso com cinco tratamentos, cinco repetições e 10 aves por repetição. Foram avaliados a porcentagem de postura, o consumo de ração, a conversão alimentar em termos de dúzias e de massa de ovos, o peso médio de ovos, a porcentagem de casca e de gema, e a porcentagem de clara. Não se observou diferença estatística significativa em todas as características. O índice de coloração de gema, pelo leque colorimétrico Roche, apresentou pior coloração à medida que os níveis de milheto foram crescentes nas rações. Os resultados indicam que o milheto não afetou o desempenho produtivo das aves, devendo-se recomendar o seu uso com pigmentantes sintéticos ou naturais.

Pearl millet utilization in ccommercial laying hen diets formulated on a total or digestible amino acid basis

“…Increasing replacement levels resulted in a linear decrease in yolk pigmentation index both for total (Y= 9.828 0.0141X; R 2 = 0.90) and digestible (Y = 9.894 0.0176X; R 2 =0.98) amino acid recommendations. Such effect on yolk pigmentation index corroborates previous findings reported by Café et al (1999), who also described a linear reduction in yolk pigmentation index with the increase in pearl millet levels.…”

“…There was a linear decrease in egg production (Y = 85.7153 0.07038X, R 2 = 0.89) and in egg weight (Y = 59.4950 0.02609X, R 2 = 0.85) with increasing levels of substitution of pearl millet for corn. Café et al (1999) did not report decrease in egg production due to the increase in corn substitution by pearl millet, but there was a linear decrease in egg weight during the first experimental period.…”

“…Feed intake reduced until a replacement level of 64.18%, and increased afterwards. Café et al (1999) evaluated levels of substitution of pearl millet for corn in laying hen diets and observed different patterns of feed intake during the experimental period. During the first period there was quadratic effect on feed intake and during the second period there was a linear decrease with increasing levels of pearl millet.…”

“…Some trials have been carried out to evaluate substitution of pearl millet for corn in broiler chicken and laying hen diets. Café et al (1999) evaluated the effect of different inclusion levels of pearl millet in substitution for corn in broiler chicken diets. There was a negative correlation between weight gain at 49 days old and pearl millet inclusion levels, so that weight gain was smaller in birds fed diets with 100% pearl millet.…”

“…Treatments had no effects on feed intake, egg production, egg weight and yolk weight, but pearl millet inclusion resulted in less pigmented eggs. Café et al (1999) assessed performance and egg quality of commercial laying hens fed diets with increasing substitution levels of metabolizable energy of pearl millet for corn. There were no statistical differences in egg production, feed intake, feed conversion, mean egg weight, and percentages of shell, yolk and albumen.…”