Reduced fertility associated with low progesterone postbreeding and increased milk urea nitrogen in lactating cows.
TLDR
It is proposed that the cows in group 3 likely had embryos that initiated pregnancy recognition and prolonged luteal function, but these embryos were compromised by suboptimal exposure to progesterone early in development.About:
This article is published in Journal of Dairy Science.The article was published on 1997-07-01 and is currently open access. It has received 158 citations till now. The article focuses on the topics: Dairy cattle & Luteal phase.read more
Citations
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Journal ArticleDOI
High Feed Intake Increases Liver Blood Flow and Metabolism of Progesterone and Estradiol-17β in Dairy Cattle
TL;DR: Higher rates of LBF and steroid metabolism in lactating than in nonlactating cows may indicate chronic effects of higher feed intakes as well.
Journal ArticleDOI
Energy balance relationships with follicular development, ovulation and fertility in postpartum dairy cows☆
TL;DR: Overall, NEBAL is related to lower fertility in dairy cows both through effects exerted early in lactation and later during the breeding period, and to reduced serum progesterone concentrations during thebreeding period and to lower pregnancy rates.
Journal ArticleDOI
Fertility in the high-producing dairy cow ☆
TL;DR: To maintain or recover high fertility in modern dairy cows calls for a two-pronged approach involving both inclusion of fertility in broader breeding goals and adjustment to management practices.
Journal ArticleDOI
Reduction in size of the ovulatory follicle reduces subsequent luteal size and pregnancy rate
José Luiz Moraes Vasconcelos,José Luiz Moraes Vasconcelos,Roberto Sartori,Henrique Nunes de Oliveira,J.G. Guenther,Milo C. Wiltbank +5 more
TL;DR: In conclusion, ovulation of smaller follicles produced lowered fertility possibly because development of smaller CL decreased circulating progesterone concentrations.
Journal ArticleDOI
Effect of nutrition on endocrine parameters, ovarian physiology, and oocyte and embryo development.
TL;DR: The challenge remains to modify nutritional and management strategies in high-yielding dairy cows to maintain the levels of production made possible by genetic selection and still maintain an acceptable level of fertility.
References
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Journal ArticleDOI
Interrelationships between energy balance and postpartum reproductive function in dairy cattle.
W.R. Butler,R.D. Smith +1 more
TL;DR: 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.
Journal ArticleDOI
Plasma and milk urea nitrogen in relation to pregnancy rate in lactating dairy cattle.
W.R. Butler,J J Calaman,S W Beam +2 more
TL;DR: Based on this study, plasma and milk will yield similar results for monitoring urea nitrogen in dairy cows; PUN and MUN concentrations > 19 mg/dL were associated with approximately a 20 percentage point decrease in pregnancy rate after AI in lactating dairy cattle.
Journal ArticleDOI
Evidence for maternal regulation of early conceptus growth and development in beef cattle
TL;DR: A role of progesterone in the maternal regulation of conceptus growth and development in early pregnancy of cattle is indicated and pregnancy was maintained beyond Day 40.
Journal ArticleDOI
Milk progesterone levels in relation to conception, repeat breeding and factors influencing acyclicity in dairy cows
D C Bulman,G.E. Lamming +1 more
TL;DR: Monitoring of ovarian activity by measurement of milk progesterone levels by radioimmunoassay demonstrated that a variety of patterns was associated with the poor conception rate and a study of the post-partum interval showed that cows resumed cycles by 24 +/- 0.6 days after calving.
Journal ArticleDOI
Reduction of fertility and alteration of uterine pH in heifers fed excess ruminally degradable protein.
C.C. Elrod,W.R. Butler +1 more
TL;DR: The causes underlying the reduction of fertility associated with feeding of excess ruminally degradable protein to cattle were elucidated and plasma NH4 was variable and did not differ between treatments or days of the estrous cycle.
Related Papers (5)
Plasma and milk urea nitrogen in relation to pregnancy rate in lactating dairy cattle.
W.R. Butler,J J Calaman,S W Beam +2 more
Relationship between maternal endocrine environment, early embryo development and inhibition of the luteolytic mechanism in cows
George E Mann,G.E. Lamming +1 more