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Reproduction in Domestic Ruminants V

Reproduction in Domestic Ruminants V

Overview of Ruminant Reproduction Problems

bp0005editorial | Overview of Ruminant Reproduction Problems | REDR2002

Editorial: Reproduction in Domestic Ruminants

Webb R

As stated in the first Proceedings, the economically important domestic species have been the subject of ongoing reproductive research over many decades. The aims of researchers and clinicians have been directed at increasing fecundity and fertility, to manipulate reproduction for simpler management, to increase the genetic influence of selected individuals and importantly to improve animal welfare. A group of international researchers initiated the first symposium in Australi...

bp0005rdr1 | Overview of Ruminant Reproduction Problems | REDR2002

Reproductive challenges facing the cattle industry at the beginning of the 21st century

Sheldon IM , Dobson H

The aim of this review is to pinpoint the areas that require further research for greatest impact to improve the efficiency of dairy and beef production. Increased knowledge about the principal causes of reduced fertility is essential. Increases in milk yield have been at the expense of reduced fertility in dairy cows and although diet has a major impact, the precise interaction between nutrition and reproduction still needs to be characterized in both beef and dairy cows. Fur...

bp0005rdr2 | Overview of Ruminant Reproduction Problems | REDR2002

Aspects of reproductive performance in small ruminants – opportunities and challenges

Hanrahan JP

Ovulation rate is the principal source of variation in the reproductive rate of small ruminants. There is extensive variability in this trait both in terms of major genes and polygenes. Identification of the DNA changes responsible for the Booroola and Inverdale effects enabled testing for these mutations in any population. Surprisingly, in only one of six populations, with segregation of major genes for ovulation rate, could the effect be attributed to one of these mutations....

bp0005rdr3 | Overview of Ruminant Reproduction Problems | REDR2002

Enhancing reproductive performance in dairy buffalo: major constraints and achievements

Nanda AS , Brar PS , Prabhakar S

Buffalo are of high economic importance for farmers in several developing countries but reproductive performance is poor. A large proportion of heifers attain puberty at 3–5 years of age. A good quality diet supplemented with extra nutrients reduces the age of puberty whereas the effects of administration of exogenous GnRH or equine chorionic gonadotrophin (eCG) are equivocal. The incidence of anoestrus in buffalo ranges from 20 to 80% depending on season. Most buffal...

bp0005rdr4 | Overview of Ruminant Reproduction Problems | REDR2002

The main challenges facing camel reproduction research in the 21st century

Skidmore JA

The reproductive efficiency of camels under their natural pastoral conditions is low. The reasons for this low reproductive efficiency include the short breeding season, the late age of reaching puberty and the long gestation period of 13 months. The introduction of controlled breeding programmes is important but several problems have to be considered. For example, oestrous behaviour is very vague and difficult to interpret, as it does not often relate to follicular developmen...