Evaluation of timed insemination during summer heat stress in lactating dairy cattle

被引:85
作者
de la Sota, RL [1 ]
Burke, JM [1 ]
Risco, CA [1 ]
Moreira, F [1 ]
DeLorenzo, MA [1 ]
Thatcher, WW [1 ]
机构
[1] Univ Florida, Dept Dairy & Poultry Sci, Gainesville, FL 32611 USA
关键词
cattle; GnRH agonist; heat stress; timed insemination; ovulation synchronization;
D O I
10.1016/S0093-691X(98)00025-9
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
We wished to compare the effect of summer heat stress on pregnancy rate in cows that were inseminated at a set interval associated with a synchronized ovulation vs whose inseminated upon routine estrus detection. The study was carried out on a commercial dairy farm in Florida from May to September 1995. Lactating dairy cows were given PGF(2 alpha) (25 mg im) at 30 + 3 d postpartum and randomly assigned to be inseminated at a set time (Timed group) or when estrus was detected (Control group). Cows in the Timed group were synchronized by sequential administration of Buserelin (8 mu g im) on Day 0 at 1600 h, PGF(2 alpha) (25 mg im) on Day 7 at 1600 h and Buserelin (8 mu g im) on Day 9 at 1600 h. They were inseminated on Day 10 between 0800 and 0900 h (Day 9 + 16 h). Cows in the Control group were given PGF(2 alpha) at 57 + 3 d postpartum and inseminated when detected in estrus. Estrus detection or insemination rate for control insemination cows was 18.1 +/- 2.5% versus 100% for time inseminated cows (P < 0.01). Mean interval from PGF(2 alpha) to insemination was shorter for time inseminated cows (3 +/- 2.1 d < 35.5 +/- 1.9 d; P < 0.01). Pregnancy rate was greater for time inseminated cows (13.9 +/- 2.6 > 4.8 +/- 2.5%; P < 0.01) as was overall pregnancy rate by 120 d postpartum (27.0 +/- 3.6 > 16.5 +/- 3.5%; P < 0.05). Number of days open for cows conceiving by 120 d postpartum was less for time inseminated cows (77.6 +/- 3.8 < 90.0 +/- 4.2 d; P < 0.05), as was interval to first service (58.7 +/- 2.1 < 91.0 +/- 1.9 d; P < 0.01). Services per conception were greater for time inseminated cows (1.63 +/- 0.10 > 1.27 +/- 0.11, P < 0.05). The timed insemination program did improve group reproductive performance. However, the timed insemination program will not protect the embryo from temperature-induced embryonic mortality, but management limitations induced by heat stress on estrus detection are eliminated. An economical evaluation of the timed insemination program indicates an increase in net revenue per cow with implementation tof timed insemination for first service during the summer months. (C) 1998 by Elsevier Science Inc.
引用
收藏
页码:761 / 770
页数:10
相关论文
共 25 条
[1]   EFFECTS OF CLIMATIC AND MANAGEMENT FACTORS ON CONCEPTION RATE OF DAIRY-CATTLE IN SUB-TROPICAL ENVIRONMENT [J].
BADINGA, L ;
COLLIER, RJ ;
THATCHER, WW ;
WILCOX, CJ .
JOURNAL OF DAIRY SCIENCE, 1985, 68 (01) :78-85
[2]   EFFECT OF ENVIRONMENTAL HEAT-STRESS ON FOLLICULAR DEVELOPMENT AND STEROIDOGENESIS IN LACTATING HOLSTEIN COWS [J].
BADINGA, L ;
THATCHER, WW ;
DIAZ, T ;
DROST, M ;
WOLFENSON, D .
THERIOGENOLOGY, 1993, 39 (04) :797-810
[3]   EFFECT OF SEASON ON FOLLICULAR DYNAMICS AND PLASMA-CONCENTRATIONS OF ESTRADIOL-17-BETA, PROGESTERONE AND LUTEINIZING-HORMONE IN LACTATING HOLSTEIN COWS [J].
BADINGA, L ;
THATCHER, WW ;
WILCOX, CJ ;
MORRIS, G ;
ENTWISTLE, K ;
WOLFENSON, D .
THERIOGENOLOGY, 1994, 42 (08) :1263-1274
[4]  
BARKER R, 1994, COMPENDIUM, P801
[5]   Evaluation of timed insemination using a gonadotropin-releasing hormone agonist in lactating dairy cows [J].
Burke, JM ;
DelaSota, RL ;
Risco, CA ;
Staples, CR ;
Schmitt, EJP ;
Thatcher, WW .
JOURNAL OF DAIRY SCIENCE, 1996, 79 (08) :1385-1393
[6]  
CHENAULT JR, 1992, LARGE DAIRY HERD MAN, P116
[7]   EFFECTS OF RECOMBINANT BOVINE SOMATOTROPIN (SOMETRIBOVE) ON OVARIAN-FUNCTION IN LACTATING AND NONLACTATING DAIRY-COWS [J].
DELASOTA, RL ;
LUCY, MC ;
STAPLES, CR ;
THATCHER, WW .
JOURNAL OF DAIRY SCIENCE, 1993, 76 (04) :1002-1013
[8]   OPTIMIZING MODEL - INSEMINATION, REPLACEMENT, SEASONAL PRODUCTION, AND CASH FLOW [J].
DELORENZO, MA ;
SPREEN, TH ;
BRYAN, GR ;
BEEDE, DK ;
VANARENDONK, JAM .
JOURNAL OF DAIRY SCIENCE, 1992, 75 (03) :885-896
[9]  
DELORENZO MA, 1992, LARGE DAIRY HERD MAN, P698
[10]   DEVELOPMENTAL-CHANGES IN EMBRYONIC RESISTANCE TO ADVERSE-EFFECTS OF MATERNAL HEAT-STRESS IN COWS [J].
EALY, AD ;
DROST, M ;
HANSEN, PJ .
JOURNAL OF DAIRY SCIENCE, 1993, 76 (10) :2899-2905