NDLI: The importance of interactions among nutrition, seasonality and socio-sexual factors in the development of hormone-free methods for controlling fertility.

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Functional differences in the growth hormone and insulin-like growth factor axis in cattle and pigs: implications for post-partum nutrition and reproduction.

The manipulation of gametes and embryos in farm animals.

Towards ethically improved animal experimentation in the study of animal reproduction.

Endocrine disruptors and other food-contaminating environmental pollutants as risk factors in animal reproduction.

Long chain fatty acids of diet as factors influencing reproduction in cattle.

Seasonality of reproduction in mammals: intimate regulatory mechanisms and practical implications.

Mechanisms for dominant follicle selection in monovulatory species: a comparison of morphological, endocrine and intraovarian events in cows, mares and women.

Regulation of luteal function and corpus luteum regression in cows: hormonal control, immune mechanisms and intercellular communication.

Captive breeding of cheetahs in South Africa--30 years of data from the de Wildt Cheetah and Wildlife Centre.

Non-invasive monitoring of hormones: a tool to improve reproduction in captive breeding of the Eurasian lynx.

Reproductive biotechnology and gene mapping: tools for conserving rare breeds of livestock.

Genetic improvement of dairy cow reproductive performance.

Nutrient prioritization in dairy cows early postpartum: mismatch between metabolism and fertility?

Corpus luteum-endometrium-embryo interactions in the dairy cow: underlying mechanisms and clinical relevance.

Improved detection of reproductive status in dairy cows using milk progesterone measurements.

Genetic aspects of reproduction in sheep.

The importance of interactions among nutrition, seasonality and socio-sexual factors in the development of hormone-free methods for controlling fertility.

Developmental capabilities of embryos produced in vitro from prepubertal lamb oocytes.

Updates on reproductive physiology, genital diseases and artificial insemination in the domestic cat.

Reproduction of the female ferret (Mustela putorius furo).

Physiology of the canine anoestrus and methods for manipulation of its length.

The ethics and role of AI with fresh and frozen semen in dogs.

Basic aspects of the control of GnRH and LH secretions by kisspeptin: potential applications for better control of fertility in females.

Controlling animal populations using anti-fertility vaccines.

The expanding role of recombinant gonadotropins in assisted reproduction.

Recent progress in embryonic stem cell research and its application in domestic species.

Reproduction in domestic buffalo.

Postpartum ovarian activity in South Asian zebu cattle.

Mother-offspring interactions in zebu cattle.

An update on reproduction in yak and mithun.

Follicle development in mares.

Proteins associated with the early intrauterine equine conceptus.

Heat stress, the follicle, and its enclosed oocyte: mechanisms and potential strategies to improve fertility in dairy cows.

Fertilization and early embryonic development in the porcine fallopian tube.

Mastitis in post-partum dairy cows.

Embryonic and early foetal losses in cattle and other ruminants.

Role of cell death ligand and receptor system on regulation of follicular atresia in pig ovaries.

Epigenetic programming of porcine endometrial function and the lactocrine hypothesis.

Endocrine regulation of the establishment of spermatogenesis in pigs.

Male germ cell transplantation.

Sexual maturation in the bull.

Epigenetic regulation of foetal development in nuclear transfer animal models.

A proposed role for VEGF isoforms in sex-specific vasculature development in the gonad.

Comparative aspects of the endotoxin- and cytokine-induced endocrine cascade influencing neuroendocrine control of growth and reproduction in farm animals.

Energy metabolism and leptin: effects on neuroendocrine regulation of reproduction in the gilt and sow.

Somatic cell nuclear transfer in horses.

Application and commercialization of flow cytometrically sex-sorted semen.

Low-dose insemination in pigs: problems and possibilities.

Production of transgenic farm animals by viral vector-mediated gene transfer.

Use of microarray technology to profile gene expression patterns important for reproduction in cattle.

Breeding soundness evaluation and semen analysis for predicting bull fertility.

Sanitary procedures for the production of extended semen.

Management of goat reproduction and insemination for genetic improvement in France.

Regulation of the spermatogonial stem cell niche.

Factors affecting oocyte quality: who is driving the follicle?

Selected aspects of advanced porcine reproductive technology.

Climbing Mount Efficiency--small steps, not giant leaps towards higher cloning success in farm animals.

Nuclear transfer of freeze-dried somatic cells into enucleated sheep oocytes.

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The importance of interactions among nutrition, seasonality and socio-sexual factors in the development of hormone-free methods for controlling fertility.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Scaramuzzi, R. J. Martin, G. B.
Description	Country affiliation: France Author Affiliation: Scaramuzzi RJ ( UMR Physiologie de la Reproduction et des Comportements, L'Institut National de la Reproduction, Nouzilly, France. rscara@rvc.ac.uk)
Abstract	Around the world, consumers are demanding animal products that are produced to agreed standards for human health, environmental management and animal welfare. This has led to the development in Australia of the concept of 'clean, green and ethical' (CGE) animal production based on the manipulation of nutrition ('focus feeding') and the application of phenomena, such as the 'male effect', to provide 'natural' methods for managing small ruminant production systems. With respect to the management of fertility, CGE involves utilization of the inherited responses of animals to environmental factors to manipulate their reproductive processes. The successful development and implementation of this new generation of management tools depends on a thorough yet holistic understanding of the interactions among environmental factors and the ways these interactions affect reproductive physiology and behaviour of the animal. For sheep and goats, a central aspect of CGE management is the way in which ovarian function is affected by three major factors (nutrition, photoperiod and socio-sexual signals) and by interactions among them. Nutrition can exert two profound yet contrasting types of effect on ovarian activity: (i) the complete inhibition of reproduction by undernutrition through the hypothalamic mechanism that controls ovulation and (ii) the enhancement of fecundity by nutritional supplementation, through a direct ovarian mechanism, in females that are already ovulating. A similarly profound control over ovarian function in female sheep and goats is exerted by the well-known endocrine responses to photoperiod (seasonality) and to male socio-sexual signals. The 'male effect' already has a long history as a valuable technique for inducing a synchronized fertile ovulation during seasonal and post-partum anoestrus in sheep and goats. Importantly, experimentation has shown that these three major environmental factors interact, synergistically and antagonistically, but the precise nature of these interactions and their significance to reproductive outcomes are not well understood. Most research to date has been with small ruminants but CGE principles can be applied to any species in a managed environment. For example, a male effect has been reported for lactating cattle and, in the horse, the pattern of seasonality of oestrus can be altered by nutrition. Well-fed mares have a longer breeding season and some animals become non-seasonal. Similar observations have been reported for sheep and goats. By working towards a holistic perspective of the physiology, nutrition, genetics and behaviour of our animals, we will be able to formulate ways to manipulate the animals' environment that will improve management, productivity and profitability and, simultaneously, promote a CGE industry.
File Format	HTM / HTML
ISSN	09366768
Issue Number	Suppl 2
Volume Number	43
e-ISSN	14390531
Journal	Reproduction in Domestic Animals
Language	English
Publisher	Wiley
Publisher Date	2008-07-01
Publisher Place	Germany
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Reproductive Medicine Discipline Veterinary Medicine Discipline Zoology Animal Nutritional Physiological Phenomena Physiology Breeding Methods Fertility Reproduction Ruminants Sexual Behavior, Animal Animal Husbandry Ethics Animals Cattle Conservation Of Natural Resources Environment Female Goats Horses Male Photoperiod Seasons Sex Factors Sheep Species Specificity Journal Article Review
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology Endocrinology Biotechnology

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