4Pursley J R. Synchronization of ovulation in dairy cows using PGF2alpha and GnRH [J]. Theriogenology, 1995, 44:915 -923.
5Busch D C,Sehafer D J, Wilson D J, et al . Timing of artificial insemination in postpartum beef cows following administration of the CO-Synch+ controlled internal drug-release protoeol[J]. J Anita Sci, 2008, 86 (7): 1519-1525.
6Tubman LM,Brink Z,Suh T K, et al . Characteristics of calves produced with sperm sexed by flow cytometry/ cell sorting[J]. J Anita Sci, 2004,82:1029-1036.
7Schenk J L, Brink Z, Suh T K. Use of competitive fertilization to evaluate a simple laser for flow cytometrie sexing of bovine sperm[J]. Reprod Fertil Dev,2005,17:306.
8BREHME U,GAGNAUX D,POFFET J R.Dairy cattle managemeng in cold housing-experience gained on East German dairy farms[C]//Proceedings of the fifth international symposium on livestock farming systems.Posieux,Fribourg,Switzerland,1999:346-353.
9SILVA I M D,PANDORFI H,ALMEIDA G L P D,et al.Spatial analysis of thermal conditiongs of the premilking dairy cattle under climatizationg regimes[J].Revista brasileira de engenharia agricola e ambiental,2012,16(8):903-909.
10CALEGARI F,CALAMARI L,FRAZZI E.Misting and fan cooling of the rest area in a dairy barn[J].Int J Biometeorol,2012,16(2):287-295.
