Fecal pats help to predict nutrient intake by cattle during summer on California's annual rangelands

مرکز و کتابخانه مطالعات اسلامی به زبان های اروپایی

منو

" Fecal pats help to predict nutrient intake by cattle during summer on California's annual rangelands "
Jinks, Angela D.; Oltjen, James W; Robinson, Peter H; Calvert, Chris C.

Document Type	:	AL
Record Number	:	944540
Doc. No	:	LA2g04t050
Language of Document	:	English
Main Entry	:	Jinks, Angela D.; Oltjen, James W; Robinson, Peter H; Calvert, Chris C.
Title & Author	:	Fecal pats help to predict nutrient intake by cattle during summer on California's annual rangelands [Article]\ Jinks, Angela D.; Oltjen, James W; Robinson, Peter H; Calvert, Chris C.
Title of Periodical	:	California Agriculture
Volume/ Issue Number	:	64/2
Date	:	2010
Abstract	:	Near-infrared spectroscopy (NIRS) of fecal samples has been used to predict the crude protein and digestible organic matter of forages consumed by grazing animals. However, for NIRS predictions to be accurate, the equation used must be based on samples from the target population. The Texas A&M Grazinglands Animal Nutrition Laboratory has developed a NIRS program based on forages in Texas, the Midwest and Canada's lower prairie provinces. California producers have been using these equations even though they had never been evaluated for California conditions. We conducted beef-cattle digestibility trials on two California rangeland summer forages to produce forage-fecal pairs for testing the existing NIRS ones and developing new equations as necessary. The predictions from the original equations were significantly different from the true values determined in the digestibility trials. The addition of data from this research has improved the predictive capability for both crude protein and digestible organic matter in California.