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Reproductive management of lactating dairy cows using synchronization of ovulation.
Lactating dairy cows have poor reproductive efficiency because of low fertility and low rates of estrus detection. To eliminate the dependence on detection of estrus, we have recently developed aExpand
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Selection of the dominant follicle in cattle.
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Pregnancy rates per artificial insemination for cows and heifers inseminated at a synchronized ovulation or synchronized estrus.
Two synchronization protocols were tested for lactating dairy cows and heifers. Nulliparous dairy heifers (13 to 23 mo; n = 155) and primiparous and multiparous dairy cows (60 to 289 d postpartum; nExpand
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Comparison of ovarian function and circulating steroids in estrous cycles of Holstein heifers and lactating cows.
Ovarian function was compared between nulliparous heifers (n = 29; 10 to 16 mo old) and lactating Holstein cows (n = 31; 55.9 +/- 3.5 d postpartum). Follicular dynamics, corpus luteum growth, andExpand
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Reducing dry period length to simplify feeding transition cows: milk production, energy balance, and metabolic profiles.
Sixty-five Holstein cows were used to evaluate management schemes involving altered dry period (DP) lengths on subsequent milk production, energy balance (EB), and metabolic variables. Cows wereExpand
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High feed intake increases liver blood flow and metabolism of progesterone and estradiol-17beta in dairy cattle.
Increased liver blood flow (LBF) resulting from elevated feed intake in lactating dairy cows may increase steroid metabolism. Continuous infusion of bromosulphthalein (BSP; specifically metabolizedExpand
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Relationship between level of milk production and estrous behavior of lactating dairy cows.
The objective of this study was to determine if there is an association between level of milk production and duration of estrus as determined by standing activity recorded by a radiotelemetry system.Expand
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Fertilization and early embryonic development in heifers and lactating cows in summer and lactating and dry cows in winter.
Two experiments in two seasons evaluated fertilization rate and embryonic development in dairy cattle. Experiment 1 (summer) compared lactating Holstein cows (n = 27; 97.3 +/- 4.1 d postpartum [dppl;Expand
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Synchronization of ovulation in dairy cows using PGF2alpha and GnRH.
This paper reports a new method for synchronizing the time of ovulation in cattle using GnRH and PGF(2alpha). In Experiments 1 and 2, lactating dairy cows (n=20) ranging from 36 to 280 d postpartumExpand
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Follicular Deviation and Acquisition of Ovulatory Capacity in Bovine Follicles1
Abstract Selection of dominant follicles in cattle is associated with a deviation in growth rate between the dominant and largest subordinate follicle of a wave (diameter deviation). To determineExpand
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