The Effect of Artificial Insemination Once Versus Twice per Day

Journal of Dairy Science

Volumn 80, Issue 11, 1997, Pages 3068-3071

  Graves, W M ^a   Dowlen, H H ^b   Lamar, K C ^b   Johnson, D L ^b   Saxton, A M ^a   Montgomery, M J ^a  

^a UNIVERSITY OF TENNESSEE   (United States)

^b Department of Electrical Engineering and Computer Science   (United States)

Author keywords

Artificial insemination; Breeding; Frequency; Time of breeding

Indexed keywords

ANIMAL; ANIMAL DISEASE; ARTICLE; ARTIFICIAL INSEMINATION; CATTLE; CIRCADIAN RHYTHM; ESTRUS; FEMALE; LACTATION; MALE; METHODOLOGY; PARITY; PREGNANCY;

ANIMALS; CATTLE; CIRCADIAN RHYTHM; ESTRUS DETECTION; FEMALE; INSEMINATION, ARTIFICIAL; LACTATION; MALE; PARITY; PREGNANCY;

EID: 0031267042     PISSN: 00220302     EISSN: None     Source Type: Journal    
DOI: 10.3168/jds.S0022-0302(97)76275-1     Document Type: Article

References (11)

1. Foote, R. J. 1979. Time of artificial insemination and fertility in dairy cattle. J. Dairy Sci. 62:355.
2. 2α synchronization regime. I. One daily insemination period versus use of the AM/PM rule. Theriogenology 24:495.
3. Hall, J. G., C. Branton, and E. J. Stone. 1959. Estrus, estrous cycles, ovulation time, time of service, and fertility of dairy cattle in Louisiana. J. Dairy Sci. 42:1086.
4. MacMillan, K. L., and J. D. Watson. 1975. Fertility differences between groups of sires relative to the stage of oestrus at the time of insemination. Anim. Prod. 21:243.
5. MacMillan, K. L., and J. D. Watson. 1976. Factors influencing A. B. conception rates. V. Cow age and stage at oestrus at insemination. N.Z. J. Exp. Agric. 3:29.
6. Nebel, R. L., W. L. Walker, M. L. McGilliard, C. H. Allen, and G. S. Heckman. 1994. Timing of artificial insemination of dairy cows: fixed time once daily versus morning and afternoon. J. Dairy Sci. 77:3185.
7. SAS/STAT® User's Guide, Version 6. 1989. SAS Inst., Inc., Cary, NC.
8. Stevenson, J. S., M. K. Schmidt, and E. P. Call. 1983. Estrous and intensity and conception rates in Holsteins. J. Dairy Sci. 66:275.
9. Stevenson, J. S., M. K. Schmidt, and E. P. Call. 1983. Factors affecting reproductive performance of dairy cows first inseminated after five weeks postpartum. J. Dairy Sci. 66:1148.
10. Trimberger, G. W. 1948. Breeding efficiency in dairy cattle from artificial insemination at various intervals before and after ovulation. Nebraska Agric. Exp. Stn. Bull. No. 153, Lincoln.
11. Trimberger, G. W., and H. P. Davis. 1943. Conception rate in dairy cattle by artificial insemination at various stages of oestrus. Nebraska Agric. Exp. Stn. Bull. No. 129, Lincoln.