Physiological aspects of reproduction and fertility in dairy cows

نویسنده

  • T. van der Lende
چکیده

Reproductive efficiency is an important aspect of dairy cattle production. To improve it in high yielding dairy cattle, a thorough understanding of the physiology of fertility and the reproductive physiological implications of the increasing metabolic demands associated with increasing production levels is essential. In this respect, the present paper focuses on the neuro-endocrine regulation of ovarian activity, physiological aspects of fertility in the postpartum cow and physiological aspects of regular and irregular return to oestrus after insemination.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

The physiology of multifactorial problems limiting the establishment of pregnancy in dairy cattle.

The failure of cows to successfully establish pregnancy after insemination is an important limiting factor for the efficiency of dairy production systems. The physiological reasons for this are many and pertain to the post partum and early pregnancy periods. Cows that suffer severe negative energy balance after parturition are prone to diseases (including uterine infection) that are, in part, e...

متن کامل

Effect of estradiol and cloprostenol combination therapy on expulsion of mummified fetus and subsequent fertility in four crossbred cows

Four crossbred cows with mummified fetus were utilized for the study. The cows were subjected to gynecological examination and based on the findings the cases were diagnosed as mummified fetus. The cows were treated with 2 mg estradiol valerate and 500 µg cloprostenol and were examined every 12 hr after 24 hr of the treatment for cervical dilatation and other signs related to fetal expulsion. T...

متن کامل

Applying nutrition and physiology to improve reproduction in dairy cattle.

The establishment and maintenance of pregnancy in lactating dairy cows is a complex biological event that is influenced by a multitude of factors, from the reproductive biology of the cow to managerial aspects of the dairy farm. It is often mentioned in the scientific literature that fertility in dairy cows has declined concurrent with major advances in milk production. Some of this decline is ...

متن کامل

Reproductive Success in Dairy Cows: the Linkage of Milk Yield, Nutrition, and Reproduction

During the past several decades, selection for increased milk yield has had a temporal association with declines in fertility and reproductive efficiency in dairy cows. In the US, an average annual decrease of 0.5% in conception rate at first service occurred between 1975 and 1997 (Butler and Smith, 1989; Beam and Butler, 1999). In the UK (between 1978 and 1996) and in Spain (between 1991 and 2...

متن کامل

Effect of Feeding Quickly Degradable Nitrogen on the Development of Ovarian Follicles in Lactating Dairy Cows

The objective of this study was to examine the effect of an excess intake of quickly degradable nitrogen (QDN) on ovarian follicle development. Twenty lactating dairy cows were fed mixed silage and concentrates twice daily. The control diet was a typical ration for high producing dairy cows in the United Kingdom (crude protein (CP)=17.5%; metabolizable energy (ME)=11.8 MJ/kg DM). The cows were ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2002