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Animal Science Database

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Abstract

The objective was to determine the efficiency of insemination with sexed semen at spontaneous estrus and synchronisation of ovulation, and the effects of days in milk, insemination number, parity, and daily milk yield on pregnancy rates in lactating Holstein cows. A total 1,000 first to fourth...

Author(s)
Kurykin, J.; Jalakas, M.; Kaart, T.; Jaakma, Ü.
Publisher
Lietuvos Veterinarijos Akademija, Kaunas, Lithuania
Citation
Veterinarija ir Zootechnika, 2017, No.75, pp 30-35
Abstract

This study aimed to contribute to understanding the interface between reproductive and nutritional energetic physiology in contemporary dairy cattle. Multiparous Holstein cows (n=32) between 70 and 180 days in milk were used in a study starting 10 d prior to the artificial insemination (AI) date...

Author(s)
Gomez, N. A.; Conley, A. J.; Robinson, P. H.
Publisher
Elsevier B.V., Amsterdam, Netherlands
Citation
Animal Reproduction Science, 2018, 189, pp 136-145
Abstract

Genetic selection of dairy cattle in the United States has included reproductive traits (daughter pregnancy rate, DPR; heifer conception rate, HCR), which is believed to have partly contributed to halting the decline in reproductive performance. The objectives of the current study were to evaluate...

Author(s)
Veronese, A.; Marques, O.; Moreira, R.; Belli, A. L.; Bisinotto, R. S.; Bilby, T. R.; Peñagaricano, F.; Chebel, R. C.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2019, 102, 7, pp 6624-6638
Abstract

The objective was to compare luteal area (LA), luteal blood flow (LBF), and progesterone (P4) concentration before and after artificial insemination (AI) in pregnant and open cows in the diestrus preceding insemination and during the first 21 d after insemination. A number of 119 multiparous German ...

Author(s)
Berger, H.; Lietzau, M.; Tichy, A.; Herzog, K.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2017, 104, pp 115-119
Abstract

Recent studies have shown significant associations between prepartum energy status and postpartum fertility in dairy cows; therefore, the assessment of energy status by blood metabolites and metabolic hormones and suitable improvement of management during the prepartum period may enhance...

Author(s)
Kawashima, C.; Karaki, C.; Munakata, M.; Matsui, M.; Shimizu, T.; Miyamoto, A.; Kida, K.
Publisher
Wiley-Blackwell, Melbourne, Australia
Citation
Animal Science Journal, 2016, 87, 10, pp 1218-1224
Abstract

This experiment evaluated the reproductive performance, herd exit dynamics, and lactation performance of dairy cows managed with a voluntary waiting period (VWP) of 60 or 88 d. Secondary objectives were evaluating VWP effect on cyclicity status, uterine health, systemic inflammation, and body...

Author(s)
Stangaferro, M. L.; Wijma, R.; Masello, M.; Thomas, M. J.; Giordano, J. O.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2018, 101, 1, pp 717-735
Abstract

This study investigated whether presynchronization with GnRH 6 days before initiation of the Ovsynch program improved reproductive outcomes in dairy cows. Additionally, postponement of initiation of the Ovsynch program for cows during the metestrus phase by 5 days was investigated to determine if...

Author(s)
Jeong JaeKwan; Choi InSoo; Lee SooChan; Kang HyunGu; Hur TaiYoung; Kim IllHwa
Publisher
Korean Society of Veterinary Clinics, Seoul, Korea Republic
Citation
Journal of Veterinary Clinics, 2016, 33, 4, pp 200-204
Abstract

The objectives of this experiment were to determine the effects of oral Ca supplementation on milk yield, body condition, pregnancy per artificial insemination (P/AI), and days to pregnancy in Holstein cows considered to be of low (LRM; no calving assistance, live singleton without retained...

Author(s)
Martinez, N.; Sinedino, L. D. P.; Bisinotto, R. S.; Daetz, R.; Risco, C. A.; Galvão, K. N.; Thatcher, W. W.; Santos, J. E. P.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2016, 99, 10, pp 8417-8430
Abstract

The objectives were to evaluate the pattern of re-insemination, pregnancy outcomes to re-insemination in estrus and at fixed time, and economic outcomes of lactating Holstein cows submitted to three resynchronization protocols. Cows were enrolled in the Experiment at 32±3 d after pre-enrollment ...

Author(s)
Mendonça, L. G. D.; Dewey, S. T.; Lopes, G., Jr.; Rivera, F. A.; Guagnini, F. S.; Fetrow, J. P.; Bilby, T. R.; Chebel, R. C.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2012, 77, 6, pp 1151-1158
Abstract

A total of sixteen Holstein dairy cows (35±1.1 kg/d of milk yield) were randomly assigned to consider the effects of feeding omega-3 sources on endometrial endocannabinoids system (ECS) genes expression to understand the effect mechanism of omega-3 on reproductive performances during the early...

Author(s)
Dirandeh, E.; Ghaffari, J.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2018, 121, pp 141-146

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