Interrelationships between energy balance and postpartum reproductive function in dairy cattle.
W.R. Butler,R.D. Smith +1 more
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TLDR
Negative energy balance probably acts similarly to undernutrition and may manifest in delayed ovarian activity by impinging on pulsatile secretion of LH, and lower availability of glucose and insulin may also decrease LH pulsatility or limit ovarian responsiveness to gonadotropins.About:
This article is published in Journal of Dairy Science.The article was published on 1989-03-01 and is currently open access. It has received 1140 citations till now. The article focuses on the topics: Dairy cattle & Ovulation.read more
Citations
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Reproductive loss in high-producing dairy cattle: where will it end?
TL;DR: Critical areas for new research include control of the estrous cycle, metabolic effects of lactation on reproduction, mechanisms linking disease to reproduction, and early embryonic mortality.
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Synchronization of ovulation in dairy cows using PGF2α and GnRH
TL;DR: A new method for synchronizing the time of ovulation in cattle using GnRH and PGF2α could have a major impact on managing reproduction in lactating dairy cows, because it allows for AI to occur at a known time of Ovulation and eliminates the need for detection of estrus.
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Invited review: Body condition score and its association with dairy cow productivity, health, and welfare
TL;DR: There is relative consistency in the associations among calving and nadir BCS, and BCS change on milk production, postpartum anestrous, the likelihood of a successful pregnancy and days open, therisk of uterine infection, and the risk of metabolic disorders.
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Undesirable side effects of selection for high production efficiency in farm animals: a review
TL;DR: A biological explanation for the occurrence of negative side effects of selection is presented and future application of modern reproduction and DNA-techniques in animal breeding may increase production levels even faster than at present, which may result in more dramatic consequences for behavioural, physiological and immunological traits.
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Nutritional interactions with reproductive performance in dairy cattle
TL;DR: Nutritional interactions resulting in poor fertility of high producing dairy cows include the antecedent effects of NEBAL and effects of high dietary protein.
References
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A dairy cow body condition scoring system and its relationship to selected production characteristics [Milk production]
TL;DR: Dairy cows that increased significantly in body condition during lactation were less efficient producers, had a greater number of days open, and had high body condition scores at the end of lactation.
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A Dairy Cow Body Condition Scoring System and Its Relationship to Selected Production Characteristics
TL;DR: In this article, a scoring system with 1 to 5 scale was devised to measure body condition of dairy cows at any point during the lactation cycle, based on appearance and palpation of back and hind quarters only.
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Structure and Biosynthesis of Pro-Adrenocorticotropin/Endorphin and Related Peptides*
Betty A. Eipper,Richard E. Mains +1 more
TL;DR: The biosynthesis of ACTH and the characterization of biosynthetic precursors to ACTH are discussed, and the opioid peptides (and β-endorphin in particular) had not yet been identified.
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The gonadotropic function of insulin
Leonid Poretsky,Marcia F. Kalin +1 more
TL;DR: Clinical observations and experimental data strongly support the hypothesis that insulin possesses gonadotropic activity, when acting alone or with FSH or LH, and further investigation into this new area may yield greater insights into normal ovarian physiology and into the pathogeneses of such diverse entities as PCO, obesity, diabetes mellitus, and the syndromes of insulin resistance and acanthosis nigricans.
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Reproductive traits of Holsteins and Jerseys. Effects of age, milk yield, and clinical abnormalities on involution of cervix and uterus, ovulation, estrous cycles, detection of estrus, conception rate, and days open.
TL;DR: Clinical problems at parturition and postpartum lowered reproductive performance in both breeds and there was a slight antagonism between milk yield and reproductive performance (days open) in Jerseys but not in Holsteins.
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