References

Buvanendran, V., 1979. A review of results of breeding for milk production in the tropics and application of these results to Nigerian condition. Natl. Anim. Prod. Res. Inst. Seminar, 1: 259-275.
Direct Link  |  

Chauhan, F.S., F.O.K. Mgongo and B.M. Kessy, 1984. Recent advances in hormonal therapy of bovine reproductive disorders: A review. Vet. Bull., 54: 991-1009.
Direct Link  |  

Dawuda, P.M., L.O. Eduvie, K.A.N. Esievo and E.C.I. Molokwu, 1989. Silent oestrus manifestation in Nigerian Bunaji Zebu cows. Anim. Reprod. Sci., 21: 79-85.
CrossRef  |  Direct Link  |  

De Rensis, F., 2000. The control of reproduction in dairy cows. Dipartmento di Salute Animale, Facolta di Medicina via del Faglio, Universita di Parma, 43100, Parma, Italy, pp: 1-7.

Eduvie, L.O. and B.E. Senguin, 1982. Corpus luteum function and pregnancy rate in lactating dairy cows given human chorionic gonadotropin at middiestrus. Theriogenol., 17: 415-422.
PubMed  |  

Fetrow, J. and T. Blanchard, 1987. Economic impact of the use of prostaglandin to induce estrus in dairy cows. J. Am. Vet. Med. Assoc., 190: 163-169.
PubMed  |  Direct Link  |  

Grohn, Y.T. and P.J. Rajala-Schultz, 2000. Epidemiology of reproductive performance in dairy cows. Anim. Reprod. Sci., 60-61: 605-614.
PubMed  |  Direct Link  |  

Laudivar, C., C. Galina, A. Duchatea and R. Navarro-Fierro, 1985. Fertility trial in Zebu cattle after a natural or controlled oestrus with PGF-_2α comparing natural mating with artificial insemination. Theriogenol., 23: 421-429.
CrossRef  |  

Lokhande, S.M., D.R. Inamdar, B.M. Joshi, M.R. Bhosrekar, P. Humblot and M. Thibier, 1984. Progestagen and prostaglandin combined treatment for synchronization of estrus in post partum crossbred (Bos taurus x Bos indicus) or Zebu cows. Rev. Elev Med. Vet. Pays Trop., 37: 73-78.
PubMed  |  

Oyedipe, E.O., A.A. Voh, B.N. Maire and N. Pathiraja, 1986. Plasma progesterone concentrations during the oestrus cycle and following fertile and non-fertile inseminations of Zebu heifers. Br. Vet. J., 142: 41-51.
CrossRef  |  

Oyedipe, E.O., N. Pathiraja, A.A. Voh and V. Buvanendran, 1988. Use of plasma progesterone profiles for the assessment of reproductive functions in indigenous Nigerian Zebu cattle. Theriogenol., 30: 629-641.
CrossRef  |  

Pullan, N.B., 1978. Condition scoring of White Fulani cattle. Trop. Anim. Health Prod., 10: 118-120.
CrossRef  |  Direct Link  |  

Ramirez-Gondinez, J.A., F.A. Rodriguez-Almeida, O.M. Espinoza-Campa and R. Valdes-Saucedo, 2000. Use of PMSG or PGF2a at SMB in plant removal in beef cows. Agrociencia, 34: 423-428.
Direct Link  |  

Rekwot, P.I., E.O. Oyedipe, E. Mukasa-Mugerwa, V.O. Sekoni, O.P. Okinpelumi and A.A. Anam, 1999. Fertility in zebu cattle (Bos indicus) after prostaglandin administration and artificial insemination. Vet. J., 158: 53-58.

Santos, J.E.P., W.W. Thatcher, L. Pool and M.W. Overton, 2001. Effect of human chorionic gonadotropin on luteal function and reproductive performance of high-producing lactating Holstein dairy cows. J. Anim. Sci., 79: 2881-2894.
Direct Link  |  

Sorensen, A.M.J. and J.R. Bevely, 1984. Determining pregnancy in cattle. Texas Agricultural Extension Service, Texas A-M University, Bulletin 10771, pp: 1-6.

Steel, R.D.G. and J.H. Torrie, 1960. Principles and Prosecudres of Statistics with Special Reference to Biological Sciences. McGraw-Hill Book Co., New York, pp: 481.

Stevenson, J.S., 1997. Various oestrus synchronization programmes for heifers. Dairy Day, Kansas State University.

Voh, A.A., A. Larbi, S.A.S. Olorunju, K. Agyemang, B.D. Abiola and T.O. Williams, 2004. Fertility of ndama and bunaji cattle to artificial insemination following oestrus synchronization with PRID and PGF_2α, in the hot humid zone of Nigeria. Trop. Anim. Health Prod., 36: 499-511.
CrossRef  |  Direct Link  |  

Voh, A.A., D. Ogwu and E.O. Oyedipe, 2004. Fertility of bunaji (Zebu) cows after treatment with PRID with or without PGF-2α. Trop. Anim. Health Prod., 36: 483-497.
PubMed  |  

Walker, D., H. Ritchie, D. Hwakins and C. Gibson, 1994. Getting the cows herd bred. Michigan State University Extension, Michigan State University Extension Bulletin, 23290001.

Zakari, A.Y., E.C.I. Molokwu and D.I.K. Osori, 1981. Effects of season on the oestrus cycle of Zebu cows (Bos indicus) indigenous to Northern Nigeria. Vet. Record, 109: 213-215.