George C, Fahey J. Forage Quality, Evaluation, and Utilization [M]. Madison,Wisconsin,USA:American Society of Agronomy, Crop Science Society of America and Soil Science Society of America,1994:450-493
Packham R G. Feed Information and Animal Production [M]. Farnham Royal,Slough,UK:Commonwealth Agricultural Bureaux and Feed and International Network of Feed Information Centres,1983:115-118
[7]
Penning P D, Hooper G E. An evaluation of the use of shorter weight changes in grazing sheep for estimating herbage intake [J]. Grass Forage Science,1985,40(1):79-84
[8]
Holmes W. Grazing management[M]//Holmes W. Grass: Its Production and Utilization. Oxford, UK: British Grassland Society and Blackwell Scientific Publications,1980:125-173
[9]
Forbes J M. Voluntary Food Intake and Diet Selection in Farm Animals [M]. Walling ford, Oxon, UK: Commonwealth Agricultural Bureau International,1995
Blaxter K L, Mitchell H H. The factorization of the protein requirements of ruminants and of the protein values of feeds, with particular reference to the significance of the metabolic fecal nitrogen [J]. Journal of Animal Science,1948,7(3):351-372
[14]
Leite E R, Stuth J W. Value of multiple fecal indexes for predicting diet quality and intake of steers [J]. Journal of Range Management,1990,43(2):139-143
Streeter C L. A review of techniques used to estimate in vivo digestibility of grazed forage [J]. Journal of Animal Science,1969,29(5):757-768
[17]
Schneider B H, Flatt P. The Evaluation of Feeds through Digestibility Experiments [M]. Athens, USA: The University of Georgia Press,1975
[18]
Minson D J. Forage in Ruminant Nutrition [M]. London, U K: Academic Press,1990
[19]
Vans P J. Nutritional Ecology of the Ruminant [M]. Second Edition Ithaca, New York, USA:Cornell University Press,1994
[20]
Greenhalgh J F D. An introduction to herbage intake measurements[M]//Leaver J D. Herbage Intake Handbook. Hurley, Berkshire, U K: British Grassland Society,1982
Stevenson, Audrey E, Langen H. Measurement of feed intake by grazing cattle and sheep. Ⅶ. modified wet digestion method for determination of chromic oxide in faeces [J]. New Zealand Journal Agricultural Research,1960,3(2):314-319
[23]
杨胜. 饲料分析及饲料质量检测技术[M]. 北京:北京农业大学出版社,1993:17-21
[24]
Wang C J, Tas B M, Glindemann T, et al. Fecal crude protein content as an estimate for the digestibility of forage in grazing sheep [J]. Animal Feed Science and Technology,2009,149(3/4):199-208
[25]
Manske L L. Adaptive tolerance mechanisms in grass plants[C]//Abouguendia Z. Total ranch management in the Northern Great Plains. Regina, Saskatchewan, Canada: Grazing and pasture technology program, Saskatchewan Agriculture and Food,1996:97-99
[26]
Olson B E, Richards J H. Spatial arrangement of tiller replacement in Agropyron-desertorum following grazing [J]. Oecologia,1988,76(1):7-10
[27]
Coyne P I, Trlica M J, Owensby C E, et al. Carbon and nitrogen dynamics in range plants[M]//Bedunah D. J, Sosebee, R.E. Wildland plants: physiological ecology and developmental morphology. Society for Range Manage, Denver, USA,1995:59-167
[28]
Manske L L. Can native prairie be sustained under livestock grazing?[C]//Thorpe J, Steeves T A, Gollop M. Proceedings of the fifth prairie conservation and endangered species conference. Provincial Museum of Alberta
Lukas M, Sudekum K H., Rave G, et al. Relationship between fecal crude protein concentration and diet organic matter digestibility in cattle [J]. Journal of Animal Science,2005,83(6):1332-1344
[32]
Wang C J, Tas B M, Glindemann T, et al. Fecal crude protein content as an estimate for the digestibility of forage in grazing sheep [J]. Animal Feed Science and Technology,2009,149(3/4):199-208
