Project Number: 5434-31000-016-07
Start Date: Jul 01, 2008
End Date: Sep 30, 2012
Beef cattle owned by the Montana Agricultural Experiment Station (MAES) will be used to develop new reproductive, genetic and nutrient management strategies for rangeland based animal agriculture. Effects of these strategies on the state of the rangeland resource and product characteristics will also be evaluated. Four distinct cattle populations are used: Line 1 Hereford, an intercross (CGC) of Charolais (25%), Red Angus (50%) and Tarentaise (25%), and two predominantly Hereford-Angus crossbred herds. Line 1 Hereford cattle are ~30% inbred, with consequently reduced fitness, and have close ties to the bovine genome sequence and the general US Hereford population. These characteristics facilitate assessing genetic factors affecting fitness and assure relevance to the industry. Two distinct nutritional environments will be imposed on the CGC population to challenge the nutrition-reproduction interrelationship. One Hereford-Angus cowherd provides donor and recipient females for studies using embryo transfer. The other Hereford-Angus cowherd calves in two distinct timeframes and thus has differential synchrony between nutritional value of range forage and nutrient requirements of the cows. To address a broad spectrum of customer interests, we envision a mixture of basic investigations and applied studies. Results will be summarized and disseminated to producers, researchers, rangeland managers, and other interested parties.