Digestão dos nutrientes e balanço de compostos nitrogenados em cabras alimentadas com quatro níveis de proteína

Fonseca, Cláudio César; Valadares, Rilene Ferreira Diniz; Filho, Sebastião de Campos Valadares; Leão, Maria Ignêz; Marcondes, Marcos Inácio

doi:10.1590/s0102-09352008000100027

Cited by 7 publications

(5 citation statements)

References 12 publications

(9 reference statements)

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“…These results were higher those reported by Fonseca et al (2008), 1.53-1.74 kg day -1 , using diets for lactating goats with CP levels of 115-175 g kg -1 of DM, observing no effects on dry matter intake and organic matter despite the lower NDF level in the diet, which was 581.6 g kg -1…”

Section: Resultscontrasting

confidence: 57%

Crude protein levels in diets containing pelleted concentrate for lactating goats: intake, digestibility, milk production and composition

et al. 2015

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This study aimed to evaluate the effects of crude protein (100, 130, 160 and 190 g kg -1 of dry matter) of diets composed of 200 g kg -1 of Tifton 85 grass hay and 800 g kg -1 of pelleted concentrate on intake, nutrient digestibility, production and composition of milk in lactating goats. Eight female Saanen goats with 42.7 ± 1.43 kg and 57.7 ± 7.37 days of lactation and milk production of 2 ± 0.22 kg at the beginning of the experiment were housed in individual 1.32 × 3.10 m stalls and distributed into two 4 × 4-balanced Latin squares. Intake of dry matter, organic matter, crude protein, neutral detergent fiber corrected for ash and protein, ether extract and total digestible nutrients showed a quadratic effect, with maximum intake of 2.030; 2.000; 305; 769; 55 and 1.574 g day -1 at the levels of 140.7; 140.8; 189.2; 140.9; 144.9 e 142.7 g kg -1 DM, respectively. Digestibility of dry matter, organic matter, crude protein, non-fibrous carbohydrates, ether extract and total digestible nutrient level varied linearly, with increases estimated at 0.54; 0.50, 2.02, 0.49, 0.80 and 0.63 g/100g for each percentage unit of protein added to the diet, respectively. Milk production was affected, with increase of 0.54 g for each 1% crude protein added to the diet. Milk lactose level decreased linearly, unlike the fat level, which increased linearly. Protein level showed a quadratic behavior, with a maximum of 36.7 g per kg of milk at the level of 160.5 g per kg of DM. It is recommended to use crude protein between 135 g and 150 g per kg of dry matter of diets consisting of 800 g of pelleted concentrate (composed of soybean meal replacing the alfalfa hay as protein source) per kg of DM for lactating goats producing 2 kg of milk per day.

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Section: Resultscontrasting

confidence: 57%

Crude protein levels in diets containing pelleted concentrate for lactating goats: intake, digestibility, milk production and composition

et al. 2015

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“…Four studies were used for the dry matter digestibility, consisting of one doctoral thesis and three scientific articles (Silva, 2005;Fonseca et al, 2008;Zambom et al, 2008;Branco et al, 2011), totaling 16 treatments and 83 experimental units. For the NDF levels, three studies were used: one doctoral thesis and two scientific articles (Carvalho et al, 2006;Branco et al, 2011;Felisberto, 2011), totaling 14 treatments and 51 experimental units.…”

Section: Methodsmentioning

confidence: 99%

Factors affecting feed efficiency in dairy goats

et al. 2014

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-The objective of this study was to present some factors affecting feed efficiency in dairy goats. To develop our work, individual and average data from performance experiments with lactating goats were used. The following variables were evaluated: gross feed efficiency, adjusted feed efficiency, dry matter intake, milk-yield, 3.5% fat-corrected milk yield, dry matter digestibility, dietary neutral detergent fiber content, different roughage-to-concentrate ratios and body weight. The statistical analyses involved the application of descriptive and dispersion measures besides Pearson's correlation coefficient and linear regression analysis. The analyzed variables were highly correlated with feed efficiency. The feed efficiency of lactating goats was affected by the milk fat correction, dry matter digestibility, dietary fiber content, proportion of roughage in the diet and body weight. Among these factors, standardization of the milk fat appeared to be the most efficient in correcting the feed efficiency in lactating goats. Correction of some of these factors implies greater precision in the measurement of feed efficiency.

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“…Fonseca et al (2008), observaram que a excreção de compostos nitrogenados nas fezes, na urina e no leite está diretamente relacionada ao teor de proteína da dieta e esta, por sua vez, pode influenciar de forma positiva o balanço de nitrogênio. Nesta pesquisa, o N ingerido correlacionou-se diretamente com o consumo de proteína das dietas (r = 0,99), e com a excreção fecal de N (r = 0,84).…”

Section: Resultsunclassified

“…Cabras em lactação necessitam de dietas com níveis de proteína adequados ao suprimento das necessidades de mantença e produção, com impacto na persistência da lactação e quantidade de leite produzido (FONSECA et al, 2008). Além disso, é de extrema importância que estes animais estejam bem nutridos para atenderem de forma adequada às necessidades alimentares das crias, sem comprometimento de seu desempenho e ganho de peso (RODRIGUES et al, 2007).…”

Section: Introductionunclassified

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

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Filho

et al. 2015

Revista Ciência Agronômica

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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...

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Digestão dos nutrientes e balanço de compostos nitrogenados em cabras alimentadas com quatro níveis de proteína

Cited by 7 publications

References 12 publications

Crude protein levels in diets containing pelleted concentrate for lactating goats: intake, digestibility, milk production and composition

Crude protein levels in diets containing pelleted concentrate for lactating goats: intake, digestibility, milk production and composition

Factors affecting feed efficiency in dairy goats

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

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