Encyclopedia Of Animal Science - H ppsx

... to have their foals during the months of January through May (Northern Hemisphere). However, horses are long-day breeders that have optimal reproductive success from April through July. The equine ... because of fermentation of the fiber by the microflora in the rumen, which is anterior to the small intestine, whereas the horse utilizes fiber due to the action of microflora in the hin...

Ngày tải lên: 02/07/2014, 00:20

... content of goat milk is higher than that of cow milk. However, goat milk has a lower degree of hydration, and has an inverse relationship between the mineralization of the micelle and its hydration. [13] Vitamins Goat ... in proximity to one another on the chromosomes. Of course, since Mendel was unaware of the concept of the chromosome, he would not have had any way to understa...

Ngày tải lên: 02/07/2014, 00:20

... to understand the nutrient balance in the soil and to reduce the risk of surface runoff of manure. The challenge for science is to increase our understanding of the value of manure in the soil and in the ... is accomplished in the gizzard, followed by egestion of indigestible matter out of the mouth, as in owls. [11] Although the NRC [12] has defined the nutrient require- ments...

Ngày tải lên: 02/07/2014, 00:20

... compo- nents of membrane phospholipids, where the degree of unsaturation is a key determinant of the biophysi- cal properties of the membrane. Very high proportions of 22:6o3 are present in the phospholipids ... proliferate and then mature, a process that includes hypertrophy with secretion and mineraliza- tion of matrix. Through this maturation process, the local milieu changes,...

Ngày tải lên: 02/07/2014, 00:20

... gonadotrophins have been heavily studied in the horse and human. Human chorionic gonadotrophin (hCG) is a double-chain glycoprotein, with the a chain identical to that in leuteinizing hormone (LH), ... (labyrinthine, hemochorial) Pocket gopher (Geomys) Thick (labyrinthine, hemochorial) Rat (Rattus) Thick (trabecular, hemochorial) Marmoset (Oedipomides) Thick (villous, hemochorial) Human (Homo...

Ngày tải lên: 02/07/2014, 00:20

... self-interest. THE END OF HUSBANDRY Symbolically, this contract was broken in the mid-20th century when academic departments of animal husbandry changed their names to departments of animal science. ... threatening stimulus. The adaptive changes initiated by stressors involve activation of the hypothalamic- pituitary-adrenal (HPA) axis. The hypothalamus and the Encyclopedia of...

Ngày tải lên: 02/07/2014, 00:20

... nutrient considerations that center on the physical appearance of the animals. Much of this management is subjective and has more to do with the reputation of the breeder than the nutrient requirements of the animals. CONCLUSION Effective ... those shown by the mother or father toward the young, or of the young toward their mother. [13,14] The mother may not accept her newborn. This...

Ngày tải lên: 02/07/2014, 00:20

... phosphorus. The majority of the phosphorus provided to the chicken is produced from phosphate rock. Most phosphate deposits contain high levels of fluorine, which can be toxic to animals. The ... and 450 mg of total phosphorus as the hen aged. The highest level of phosphorus was recommended for the first 16 weeks of lay, for prevention of cage layer fatigue. Lowering the phosphoru...

Ngày tải lên: 02/07/2014, 00:20

... with saliva. Through deglutition, the bolus is conveyed from the mouth to the stomach of nonruminant animals, the rumen of ruminant animals, or the avian crop, which is a dilatation of the esophagus ... health care to livestock farms was a profession. Veterinary health programs evolved from this history, which was based on the host-pathogen philosophy of disease. TRADITIONAL VETERINAR...

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... to the stressor. This axis is characterized by the release of corticotropic- releasing hormone (CRH) from the hypothalamus, which then causes the release of adrenocorticotropic hormone (ACTH) ... tissue, thereby allowing the animal to react to the stressor (often termed the fight-or-flight response. [1] Activation of the HPA axis is used to maintain a physiologic status that enables t...

Ngày tải lên: 02/07/2014, 00:20