Rabbits have also been selectively bred for susceptability to sound induced seizures (Hohenboken and Nellhaus, 1970). The first author has observed that cattle kept in a large open feedlot pen and cattle housed singly in small "dog run" pens behave differently when they are released. Depigmented areas of the body are characterized by both white hair and white skin. Cell 3, 191-200. Many leaders in the U.S. pork industry agree that the PSS gene should not be used in the production of pork (Miller, 1996). Appl. Different temperaments are helpful for herding dogs vs. guard dogs. They were arthritic and had ulcers (Purcel et al., 1989). It would be interesting to measure the amount of depigmented areas on the bodies of both normal and nervous pointers and then compare these to Dykman et al. Transport stress in animals: A review. The coping hypothesis of stereotypic behavior. The partition and utilization of metabolizable energy intake in pregnant and non-pregnant animals. Pigs which are either homozygous negative or heterozygous with one PSS gene (carrier state) will not display the symptoms of PSS when they become excited. Hudson and Rubin (1962) and Schaible and Brumbaugh (1976) both discuss deafness in dalmations, a heavily depigmented breed. Influence of overfeeding on growth, obesity, and intestinal tract in young chicks of light and heavy breeds. The exact source of these animals is unknown, but it was presumed that students from the local university released them. Asymmetry and minor physical abnormalities are signs of greater problems. Behav. A review of current poultry feeding systems and their potential acceptability to animal welfarists. Yesterday's forbidden knowledge is today's accepted fact. Elsevier, Amsterdam. Being practical people with years of practical experience with animals, both authors agree that decisions on the ethical use of biotechnology should be based on the concept of ethical cost. International: Türkçe | Deutsch | 日本語 | Suomi | Italiano | Français | Português | Nederlands | Svenska | Norsk bokmål | Español | 한국어 | Polski | Dansk. Even though the pigs grew 15% faster than the controls they had serious infirmities. In addition to dalmations, other extensively depigmented dog breeds such as Australian shepherds that are a pale color, have a high incidence of brain, ear, and eye abnormalities (Sponenberg and Lamoreaux, 1985; Schaible and Brumbaugh, 1976). Pigm. In 1991 the first author was asked to present a paper on biotechnology and meat production (Grandin, 1991). Disord. This would be especially true if the farm was poorly managed. ASAS presents this material only for "fair use" educational purposes. Sci. Reproductive efficiency is also reduced by extensive selection for muscle growth. Effects of genotype for malignant hyperthermia as determined by restriction endonuclease assay on the quality characteristics of commercial pork. 81, 217-218. Broiler breeder hens fed a bulky diet of 15% oat hulls had higher egg production than hens fed grain concentrates (Zuidhoff et al., 1995). American Society of Animal Science, Champaign, IL. 9, 76-84. Chen, C., Rainnie, D. G., Greene, R. W, and Tonegawa, S. (1994). Anim. Sorsby A., and Davey,J. J. Also, a genetic disorder called "white heifer disease" is commonly found in white heifers of the shorthorn breed, or in breeds related to them (Spriggs, 1946a,b; Rendel, 1952). The stress gene became popular because some slaughter plants in the United States pay pork producers on the basis of the quantity of lean pork instead of quality. White fur, blue eyes, and deafness in the domestic cat. Elimination of the PSS gene is not going to solve all of the welfare problems which may be associated with breeding pigs for extreme leanness or rapid muscle growth. Psychol. Buchanan, D. S. (1987). Appleby and Lawrence (1987) found that stereotypies developed in sows only when their feed intake was restricted.

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