부산대학교 도서관

Background: Feed additives are being used to counteract production losses in lactating cattle arising due to heat stress. In this context a study was conducted to study the impact of supplementing ADDONâ„¢ - Rumen support on in vitro rumen fermentation, production and health of lactating cattle during summer. Methods: To a total mixed ration (TMR), ADDONâ„¢ Rumen support was supplemented at three levels viz., No ADDONâ„¢ -RS, ADDONâ„¢ -RS at 0.07 g/100 g TMR and ADDONâ„¢ -RS at 0.15 g/100 g TMR and subjected to in vitro rumen fermentation studies using the Rumen Simulation Technique. Eighteen lactating dairy cattle at early lactation, were randomly divided into three treatment groups: T1 - No ADDONâ„¢ -RS, T2 - ADDONâ„¢ -RS at 7 g/animal/day and T3 - ADDONâ„¢ -RS at 15 g/animal/day and their body condition score, body weight, milk yield, fat and SNF content were studied during peak summer. Conclusion: Supplementation of ADDONâ„¢ -RS @ 0.15 g/100 g of TMR helped in regulating in vitro ruminal pH, significantly (p<0.05) reduced total gas and carbon dioxide production at 12 hours of incubation and methane production at 12 and 36 hours of incubation. ADDONâ„¢ -RS supplementation at both levels (0.07 g/100 g TMR and 0.15 g/100 g TMR) resulted in significant (p<0.05) increase in in vitro microbial biomass production at 12 hours of incubation. In spite of peak summer, ADDONâ„¢ -RS supplementation in lactating dairy cattle prevented changes in body condition score, weight loss and resulted in significantly (p<0.05) higher milk yield without compromising on milk fat and SNF content and decreased somatic cell count in milk and improved manure quality. [ABSTRACT FROM AUTHOR]