Hostname: page-component-848d4c4894-xfwgj Total loading time: 0 Render date: 2024-07-02T06:04:30.243Z Has data issue: false hasContentIssue false

Effects of alfalfa particle size and soybean oil on digestibility, chewing activity, milk yield and composition of early lactating Iranian Holstein cows

Published online by Cambridge University Press:  23 November 2017

Asadollah Teimouri*
Affiliation:
Department of Animal Science, Sari, Mazandaran, Islamic Republic of Iran
Khalil Arjmandi
Affiliation:
Department of Animal Science, Sari, Mazandaran, Islamic Republic of Iran
Get access

Extract

The supplemental fats can reduce milk fat and protein percentage and increase milk yield, because the addition of fat can interfere with ruminal fermentation result in decreased fibre digestion. By the way, forage particle size, however, is closely related to ruminal lipid metabolism in several ways including increase in the size and consistency of ruminal mat, increase ruminal mean retention time of the particulate and lipid and its availability for microbial attack and to reduce the rate of lipid hydrolysis and biohydrogenation, which could potentially lower and release of antimicrobial fatty acids. Jenkins et al. (1998) reported a tendency for increase production of FCM when tallow was added to diets with shortcut hay, which suggests at least a limited role of hay particle length. In addition several researchers reported that reduction of forage particle size cause increased DMI, milk yield and milk protein but decreased chewing activity, rumination, Intake time, rumen pH, milk fat percentage and fibre digestibility (Teimouri Yansari et al., 2004). Therefore, this study was conducted to evaluate the effects of alfalfa hay particle size and soybean oil on nutrient digestibility, chewing activity, milk yield and composition of early lactating Iranian Holstein cows.

Type
Posters
Copyright
Copyright © The British Society of Animal Science 2008

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Teimouri Yansari, A., Valizadeh, R., Naserian, A, Christensen, D. A.. Yu, P., and Shahroodi, F. Eftekhari. 2004. Effects of alfalfa particle size and specific gravity on chewing activity, digestibility, and performance of Holstein dairy cows. Journal of Dairy Science. 87:3912–3924.Google Scholar
Jenkins, T. C., Bertrand, J. A., and Bridges, W. C. Jr., 1998. Interactions of tallow and hay particle size on yield and composition of milk from lactating Holstein cows. Journal of Dairy Science. 81:1396–1402.Google Scholar