Effect of yeast culture (Saccharomyces cerevisiae) on adaptation of cows to postpartum diets and on lactational performance.

Abstract

Multiparous (n = 26) and primiparous (n = 18) Holstein cows were fed prepartum and postpartum total mixed diets that were, or were not, supplemented with a yeast culture (YC) for approximately 23 d prepartum and 56 d postpartum. Multiparous cows supplemented with YC selected a prepartum diet higher in CP than did unsupplemented cows, although prepartum performance of cows of both parities, as assessed by DMI and measures of body status, was not influenced by YC. The extent of the prepartum DMI depression was not influenced by YC supplementation in cows of either parity. An intake behavior study with six multiparous cows suggested that cows supplemented with YC exhibited repeated diurnal feed intake patterns until approximately 7 d prepartum, vs 10 d prepartum for unsupplemented cows. Cows of both parities supplemented with YC had numerically higher DMI and production of milk and milk components, although only DMI for multiparous cows and milk production for primiparous cows approached statistical significance. Intake behavior results suggested that cows supplemented with YC achieved repeated diurnal feed intake patterns by approximately 14 d postpartum, vs 20 d postpartum for unsupplemented cows. Concentrations of ruminal metabolites and pH did not differ between treatments, although ruminal fluid collection occurred while diurnal feed intake patterns were repeated (regular). Overall, our results can be interpreted to support a trend toward a modest postpartum improvement in performance of primiparous and multiparous cows supplemented with this YC for 23 d prepartum and 56 d postpartum. However, primiparous cows seemed to achieve this modest overall improvement primarily through enhanced postpartum DMI, whereas in multiparous cows it was due almost equally to enhanced postpartum DMI and higher energy density of the diet.

Effect of Feed Additives on Nutrient Intake and Feed Efficiency of Lactating Crossbred Cows

“…Differences between the groups were not significant (P>0.05). The results in this trial confirm those of Williams et al, (1991), Wohlt et al, (1991Wohlt et al, ( , 1998, Robinson and Garrett (1999), and Dann et al, (2000), who observed that feed additives improvement in DM intake when lactating cows were fed. Supplementation with a blend of cinnamaldehyde and eugenol as a feed additive can increase DMI and milk production in lactating dairy cows (Wall 2014).…”

Desempenho de vacas em lactação recebendo dietas com diferentes teores de amido total, acrescidas ou não de levedura (Saccharomyces cerevisiae)

“…Alguns autores observaram aumentos na ingestão de matéria seca (Williams et al, 1991;Wohlt et al, 1998), enquanto outros não observaram efeito algum (Piva et al, 1993;Robinson et al, 1999). Piva et al (1993) sugeriram que vários fatores afetam a resposta de vacas leiteiras à suplementação com levedura, destacando o estádio de lactação, o tipo de forragem fornecida, a estratégia de alimentação e a proporção volumoso:concentrado da dieta.…”

“…Apesar do interesse crescente pelo uso de probióticos para vacas leiteiras, os resultados de pesquisas com leveduras têm variado bastante. Aumentos na produção de leite em vacas leiteiras alimentadas com levedura têm sido observados por diversos pesquisadores (Williams et al, 1991;Piva et al, 1993;Adams et al, 1995;Putman et al, 1997;Kung et al, 1997;Robinson & Garret, 1999;Wohlt et al, 1998;Chaucheyras-Durand et al, 1998), mas, em alguns trabalhos, não foram relatados resultados positivos (Arambel & Kent, 1990;Dann et al, 2000;Soder & Holden, 1999;Swartz et al, 1994).…”

“…Vários autores não observaram efeito da suplementação com levedura sobre a proteína do leite (Piva et al, 1993;Swartz et al, 1994;Wohlt et al, 1998;Robinson & Garret, 1999;Soder & Holden, 1999;Dann et al, 2000).…”

“…Aumentos na ingestão de MS (Williams et al, 1991;Wohlt et al, 1998), na produção de leite (Williams et al, 1991;Piva et al, 1993;Adams et al, 1995;Putman et al, 1997;Kung et al, 1997;Robinson & Garret, 1999;Wohlt et al, 1998;Chaucheyras-Durand et al, 1998) e na composição do leite (Piva et al, 1993) têm sido observados em vacas leiteiras alimentadas com levedura. Todavia, em outros estudos nos quais se utilizou a levedura, não foram encontradas diferenças na ingestão de MS (Piva et al, 1993;Robinson & Garret, 1999) e na produção (Swartz et al, 1994) e composição do leite (Robinson & Garret, 1999;Swartz et al, 1994).…”