Sugar cane dry yeast in feeding for growing and finishing goat kids

Abstract

-It was used 27 goat kids (18 ¾ Boer + ¼ Saanen and nine Saanen; 18.0 ± 1.60 kg) distributed in a completely randomized design with factorial arrangement to evaluate productive performance and the total digestibility of dry matter and nutrients in the rations. Diets were composed of soybean meal, soybean meal + dry yeast or dry yeast as protein source, oat hay, ground corn and vitamin-mineral mixture with mean composition of 2.50 Mcal of ME/kg DM and 17.0% of crude protein on average. Digestibility was determined using indigestible neutral detergent fiber as marker. Intakes of dry matter, organic matter, crude protein and total carbohydrates were not altered by rations. However, inclusion of dry yeast in the rations reduced ingestions of ether extract, neutral detergent fiber and acid detergent fiber. Within breed groups, the ¾ Boer + ¼ Saanen goat kids showed the highest intakes of dry matter and nutrients, as well as the best means of daily gain, feed conversion and days in feedlot. Digestibilities of dry matter, organic matter, crude protein and total carbohydrates were higer -and the digesbility of ether extract was lower -for animals fed rations with dry yeast. There were no differences in digestibility of neutral detergent fiber. Rations with dry yeast showed the highest values of total digestible nutrients. Dry yeast can be used as alternative protein source in rations for goat kids because it does not change animal performance and it does have higher nutritional value than soybean meal. ¾ Boer + ¼ Saanen kids show, in feedlots, better performance in growth and finishing phases when compared to Saanen kids.Key Words: digestibility, goats, intake, performance, Saccharomyces cerevisiae Levedura seca de cana-de-açúcar na alimentação de cabritos em crescimento e terminação RESUMO -Foram utilizados 27 cabritos (18 ¾ Boer + ¼ Saanen e 9 Saanen; 18,0 ± 1,60 kg) distribuídos em delineamento inteiramente casualizado com arranjo fatorial para avaliar o desempenho produtivo e a digestibilidade total da matéria seca e dos nutrientes das rações. As dietas foram compostas de farelo de soja, farelo de soja + levedura seca ou levedura seca como fonte de proteína, feno de aveia, milho moído e mistura vitamínico-mineral, com composição média de 2,50 Mcal de EM/kg de matéria seca e 17,0% de proteína bruta. A digestibilidade foi determinada utilizando-se fibra em detergente neutro indigestível como indicador. As ingestões de matéria seca, matéria orgânica, proteína bruta e carboidratos totais não foram influenciadas pelas rações. No entanto, a inclusão de levedura seca nas rações reduziu as ingestões de extrato etéreo, fibra em detergente neutro e fibra em detergente ácido. Dentro dos grupos raciais, os cabritos ¾ Boer + ¼ Saanen foram os que apresentaram maior ingestão de matéria seca e nutrientes, assim como melhores médias de ganho diário, conversão alimentar e dias em confinamento. A digestibilidade de matéria seca, matéria orgânica, proteína bruta e carboidratos totais foi maior -e a de extrato etéreo menor -no...

Nutritive Value of Diets With Inactive Dry Yeast for Saanen Goats in the Peripartum Period

“…The observed averages for dry matter intake on prepartum period were 1513.7; 1483.2 and 1538.4 g/day and in the postpartum the averages were 1764.4; 1632.5 and 1660.3 g/day, for diets soybean meal; soybean meal plus dry yeast and dry yeast, respectively, and this suggests that dry yeast and soybean meal have similar acceptability in peripartum goats. Similarly, other studies have shown no effects of dry yeast on dry matter intake in sheep (AGUIAR et al, 2007) and goats (FREITAS et al, 2011;LIMA et al, 2011).…”

“…However, the digestibility of dry matter and nutrients can be improved when dry yeast is included in diets for heifers and goat kids, as reported by Martins et al (2000) and Lima et al (2011), respectively. Digestibility is directly influenced by the feed intake, diet composition, degradability, protein to energy ratio and factors related to the animals ( VAN SOEST, 1994).…”

“…Dry yeast was evaluated in studies of productive performance such as goat lactation curves (GOMES et al, 2014a); goat milk production and composition (GOMES et al, 2012); growing and finishing goat kids (LIMA et al, 2011). Also, the replacement of soybean meal by dry yeast as protein source in ruminant nutrition have been showed variable responses on intake and digestibility of dry matter and nutrients (FREITAS et al, 2011;GOMES et al, 2012;LIMA et al, 2012a).…”

Digestibility and performance in crossbred ½ Boer x ½ Saanen goat kids fed diets containing protected fat

“…Alcalde et al (2011), working with ¾ Boer + ¼ Saanen kids fed diets containing on average 2.65 Mcal/Kg DM and 3.6% EE formulated with oil seeds, related a food conversion of 6.58. Lima et al (2011) stated that the feed conversion can vary within the same genetic group, depending on the age of the animals and the diets supplied.…”

Levedura seca integral na alimentação de vacas lactantes

“…Altos níveis de inclusão de levedura seca de cana-de-açúcar na dieta de monogástricos pode prejudicar o desempenho dos animais, pois a baixa digestibilidade da parede celular da levedura reduz a utilização dos nutrientes da ração (Sucupira et al, 2007). O mesmo parece não ocorrer com cabras em lactação (Lima, 2010), cabras em crescimento (Lima et al, 2011) e novilhas em crescimento (Franco et al, 2010), provavelmente em razão de os animais ruminantes apresentarem flora microbiana ruminal que auxilia no processo de digestão da parece celular da levedura, e torna a levedura totalmente degradada no rúmen. Entretanto, essa característica da levedura seca pode aumentar as perdas de nitrogênio na urina e no leite e causar redução na eficiência de utilização do nitrogênio ingerido para a produção ao substituir o farelo de soja.…”