Getting Anovular Cows Pregnant
نویسندگان
چکیده
I will be using the term anovular in this presentation. This means that a cow is not ovulating. Some people prefer the term anestrus. This means a cow is not showing heat or may not be cycling. We are generally evaluating the ovaries in our studies and so we can accurately tell which cows are ovulating but not showing heat and which cows are not ovulating whether or not they are showing heat. In this paper I will discuss 2 problems related to anovular cows. First, how can anovular cows be identified? Second, how should anovular cows be treated?
منابع مشابه
Characteristics of temporal patterns of cortisol and luteinizing hormone in primiparous, postpartum, anovular, suckled, beef cows exposed acutely to bulls
BACKGROUND The physiological mechanism by which bulls stimulate resumption of ovarian cycling activity in postpartum, anovular, suckled cows after calving may involve the concurrent activation of the hypothalamic-hypophyseal-ovarian (HPO) axis and hypothalamic-hypophyseal-adrenal (HPA) axis. Thus, the objectives of this experiment were to determine if characteristics of temporal patterns of cor...
متن کاملRelationship between level of milk production and multiple ovulations in lactating dairy cows.
Our objective was to evaluate factors associated with spontaneous multiple ovulations in lactating dairy cows. Ovaries of cows [n = 267; >50 days in milk (DIM)] were evaluated weekly using ultrasound to determine spontaneous (i.e., no hormonal treatment) ovulation rate starting at 50 DIM and continuing until pregnancy diagnosis. Cows were fitted with a transmitter to record standing activity du...
متن کاملAdrenal involvement in the biostimulatory effect of bulls
BACKGROUND The objective was to evaluate if cortisol concentrations are associated with the resumption of luteal activity in postpartum, primiparous cows exposed to bulls. The hypotheses were that 1) interval from start of exposure to resumption of luteal activity; 2) proportions of cows that resumed luteal function during the exposure period; and 3) cortisol concentrations do not differ among ...
متن کاملFirst published April , 2007 in the Michigan Dairy Review
The daily challenge of getting cows pregnant is nothing new to any dairy producer. What is new is the variety of approaches that researchers are taking to understand the mechanisms underlying this problem and propose effective solutions to it. Our applied reproductive research program is focused on controlling ovarian physiology to optimize fertility of lactating dairy cows. Our goal is to deve...
متن کاملCan the "ram Effect", or the "ram Effect" plus Pmsg Be Used to Advance the Breeding Season of Southdown Ewes?
The 'ram effect' induced some seasonally anovular Southdown ewes (23%) to ovulate within 5 days of introducing Southdown rams on 10 December. Priming the ewes with medroxy progesterone acetate from intravaginal sponges for 12 days, immediately before the introduction of the rams, ensured that most of the ewes displayed oestrus at the ram-induced ovulation. The proportion of anovular ewes ovulat...
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