Diets containing leucaena or estilosantes hay in lactating mixed-breed Anglo-Nubian goats

Abstract

RESUMO -Com o intuito de avaliar dietas para cabras Anglo-Nubianas do tipo misto em lactação, foram utilizadas oito cabras com peso médio 37,9 ± 1,72 kg, entre a 2ª e 4ª ordem de lactação, no terço médio da lactação, distribuídas em duplo quadrado latino 4 x 4. A ordenha foi realizada as 7 e 16 h. Os tratamentos consistiram de quatro dietas formuladas com diferentes volumosos (silagem de capim-elefante associada ou não aos fenos de leucena ou de estilosantes) e milho em grão, acrescidas ou não do farelo de soja. A suplementação proteica com fenos de leguminosas ou a associação destes ao farelo de soja não influenciou (p > 0,05) o consumo de matéria seca, fibra em detergente ácido, fibra em detergente neutro e de nutrientes digestíveis totais. A digestibilidade das frações alimentares foi menor (p < 0,05) quando da suplementação proteica exclusiva com feno de leucena. Não houve efeito (p > 0,05) das dietas sobre a produção e composição do leite e nem influência da suplementação sobre o balanço de nitrogênio, N urinário e N no leite. Dietas formuladas com os fenos das leguminosas tropicais leucena e estilosantes, como fontes proteicas, em substituição ao farelo de soja para cabras Anglo-Nubianas do tipo misto aos 60 a 108 dias de lactação não afetam o consumo de matéria seca, a produção e a composição do leite, além de promover balanço de compostos nitrogenados positivo e atender as exigências proteicas. Recomendam-se estudos em longo prazo ou em outras fases do ciclo de produção a fim de validar o uso dessas forrageiras como fonte de proteína em dietas para cabras em lactação. Palavras-chave: Balanço de nitrogênio. Cabras em lactação. Feno de leguminosas.ABSTRACT -In order to evaluate diets for lactating mixed-breed Anglo-Nubian goats, eight goats with an average weight of 37.9 ± 1.72 kg were used. These were in their 2nd to 4th lactation number, in the middle third of the lactating period, and were distributed in a double latin 4 x 4 square. Milking was carried out at 7:00 and 16:00. The treatments consisted of four diets made up of different forages (elephant grass silage, with or without leucaena or estilosantes hay) and maize grains with or without added soybean meal. Protein supplements of leguminous hay, or mixing these with the soybean meal, did not influence (p > 0.05) the intake of dry-matter, acid detergent fibre, neutral detergent fibre or total digestible nutrients. The digestibility of the dietary fractions was lower (p < 0.05) for protein supplement with leucaena hay only. There was no effect (p > 0.05) from the diets on the production and composition of the milk, neither did the supplements influence the balance of nitrogen, urinary N, or N in the milk. For mixed-breed Anglo-Nubian goats at 60 to 108 days of lactation, the diets formulated with hay from the tropical leguminous leucaena or estilosantes as protein sources in place of soybean meal, have no effect on the dry matter intake or the production and composition of the milk, promoting a positive balance of nitrogen compounds and meeting prote...

Replacement of alfalfa hay for tropical legumes in goats diets / Substituição do feno de alfafa pelo de leguminosas tropicais em dietas de caprinos

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Advancing Agricultural Sustainability in Tropical Climates: Harnessing the Potential of Green Manuring

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