Context Detecting oestrus to facilitate the optimal timing of artificial insemination is key reproductive performance in dairy cows. Aims The aims present study were investigate relationship between activity and milk oestradiol concentrations during oestrus. Methods Accelerometers (IceQubes, IceRobotics Ltd, UK) used monitor (the number steps per day) 37 lactating Holstein–Friesian cows peri-oe...

Managers of high producing dairy herds have known for some time that optimizing reproductive efficiency is an essential issue in maintaining profitability of a dairy herd. A recent survey by the University of Wisconsin Center for Dairy Profitability asked a random sample of 2,700 dairy producers in Wisconsin to rank the importance of different dairy issues to the future profitability of their b...

During the last 10 years the U.S. dairy industry has experienced a reversal of the decades-long trend in declining fertility traits. In fact, there is evidence that, nationally, this is contributing to improvements in pregnancy rates. And while these measures are still close to their historical lows, there is reason for optimism that this reversal will continue into the future. The reasons for ...

the purpose of this research was the study of reproductive performance in postpartum dairy cows with different parities. twenty holstein dairy cows were assigned into two equal primiparous and multiparous groups. body weight and body condition score (based on 1-5 scoring) were measured every other week, starting from two weeks before calving till pregnancy confirmation. daily milk yield was als...

The feeding and rumination behaviour of dairy cows can be monitored by different techniques and can provide useful information for dairy herd management. Among feeding characteristics, individual feed intake of cows is of utmost interest, but as weighing troughs have high space and cost requirements their implementation is limited to the research area. The objective of the present study was to ...

This study aimed to prove that giving hCG injection at the time of artificial insemination and five days afterartificial in dairy cows with repeat breeder can cause pregnancy. employed 30 dairycows breeder. All samples were divided into two treatments, P1 using adose 100 IU given intramuscularly P2 a dose of100 after insemination. The results analyzed Chi-Square test. Analysis showed all treatm...

OBJECTIVE The objective of this study was to compare reproductive performance parameters for two protocols for estrus synchronization in dairy heifers in Germany. MATERIAL AND METHODS In the CIDR group (n=93) all heifers received a controlled intravaginal progesterone releasing insert (Eazi-Breed™ CIDR®; Pfizer Pharma GmbH; containing 1,38g of progesterone) on day 0. On day 7 these cows were ...

INTRODUCTION Reproductive efficiency of the dairy herd is important for the economic success of the dairy operation. One of the most important reproductive technologies of the dairy industry is artificial insemination (AI). Artificial insemination reduces the incidence of sexually transmitted diseases among cattle and increases the use of genetically superior sires to improve performance of the...

For ty cows were assigned to one of two groups and fed either a high (H) or low (L) level of ration (130% and 70% of NRC requirements for TDN, respectively). Over a period of 92 days, the H cows gained .63 kg/day and the L cows lost .15 kg/day. On day 98 of the feeding regimen, after a synchronized estrus and follicle stimulating hormone (FSH) injected twice daily for 5 days, the two groups wer...