Burfening, P. J.; Carpio, M., 1995: Improving Criollo sheep in Peru through crossbreeding. Small Ruminant Research. 17(1): 31-35 The objective of this study was to evaluate locally purchased native ‘Criollo’ ewes from the highlands of Peru and Junin ewes from Sais Tupac Amaru’s Consac production unit (3500 m above sea level) when mated to Junin, [...]
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Crossbred 
A crossbreed, or a crossbred, animal is one with purebred parents of two different breeds, varieties, or populations. The process of breeding a crossbreed animal is known as crossbreeding, which often intends to create offspring that share the desirable characteristics and traits of both parent lineages. Another common intention when it comes to crossbreeding is producing an animal with hybrid vigor (also known as heterosis or outbreeding enhancement), which is the improved or increased function of any biological quality in a hybrid offspring. Heterosis is known as the occurrence of a superior offspring through mixing the desirable genetic contributions of both its parents, which can stem from Mendelian and non-Mendelian inheritance. Crossbreeding is often used to maintain both the health and viability of animals, but irresponsible crossbreeding can also result to offspring of inferior quality or even the dilution of a purebred gene pool to the point of extinction of a specific animal breed.
A domestic animal of unknown ancestry can also be referred to as a crossbreed. In this context, only one parent or grandparent of the animal is known, but the term “mixed breeding” is technically more appropriate and accurate. On the other hand, the term outcross refers to the type of crossbreeding is used within a specific purebred breed in order to increase the genetic diversity within that specific breed, especially in cases when it is essential to avoid inbreeding.
There are systems of crossbreeding for cattle animals. An example is with purebred females that have adapted to a specific environment that are crossed with purebred bulls from another type of environment in order to produce a generation with the traits of both parents. Dogs are also commonly used for crossbreeding, with crossbred animals being popular because of their high hybrid vigor combined with relative attractiveness in the animal.
This category contains scientific information on crossbreed, an animal with purebred parents of two different breeds, varieties, or populations.
Heritabilities and genetic correlations of body weight, testis growth and ewe lamb reproductive traits in crossbred sheep
Fossceco, S. L.; Notter, D. R., 1995: Heritabilities and genetic correlations of body weight, testis growth and ewe lamb reproductive traits in crossbred sheep. Animal Science (pencaitland). 60(2): 185-195 Heritabilities (h-2) and genetic correlations (rG) involving body weights, measures of testes size and ewe lamb reproduction were calculated using 953 spring-born lambs produced during formation [...]
Gonadotropin stimulation regimens for follicular aspiration and in vitro embryo production from calf oocytes
Armstrong, D. T.; Irvine, B. J.; Earl, C. R.; Mclean, D.; Seamark, R. F., 1994: Gonadotropin stimulation regimens for follicular aspiration and in vitro embryo production from calf oocytes. Theriogenology. 42(7): 1227-1236 Crossbred beef times dairy calves were randomly allocated at 3 wk of age to different gonadotropin treatment regimens for stimulation of follicle development [...]
Evidence for two independent domestications of cattle
Loftus, Rt; Machugh, De; Bradley, Dg; Sharp, Pm; Cunningham, P., 1994: Evidence for two independent domestications of cattle. Proceedings of the National Academy of Sciences of the United States of America, 91(7): 2757-2761 The origin and taxonomic status of domesticated cattle are controversial. Zebu and taurine breeds are differentiated primarily by the presence or absence [...]
Effects of passive immunization of ewes against an inhibin-peptide on gonadotropin levels, ovulation rate, and prolificacy
Kusina, Nt; Meyer, Rl; Carlson, Km; Wheaton, Je, 1995: Effects of passive immunization of ewes against an inhibin-peptide on gonadotropin levels, ovulation rate, and prolificacy. Biology of reproduction 52(4): 878-884 The experimental objectives were to determine whether injection of semi-purified (sp; ammonium sulfate-precipitated) and highly purified (hp; immunoaffinity-purified) ovine antibody (Ab) against an inhibin-peptide fragment [...]
Effects of individual stallions and mare breeds on assisted fertilization in vitro
Hochi, Shinichi; Choi, Young Ho; Korosue, Kenji; Sato, Kunitada; Oguri, Norihiko, 1994: Effects of individual stallions and mare breeds on assisted fertilization in vitro. Journal Of Equine Science. 5(3): 77-81 Comparative experiments were conducted to assess the effect of individual stallions on the fertilizing ability of the spermatozoa in in-vitro-matured and partially zona-removed (Pzr) equine [...]
Effects of body condition, reproductive status and breed on follicular population and oocyte quality in cows
Dominguez, M. M., 1995: Effects of body condition, reproductive status and breed on follicular population and oocyte quality in cows. Theriogenology. 43(8): 1405-1418 This study was designed to evaluate the influences of body condition score (Bcs), reproductive status and breed on the number of ovarian follicles and the quality of oocytes developing in them in [...]
Cereal beef production from crossbred heifers
Gerhardy, Hubert; Griepenkerl, Lutz, 1994: Cereal beef production from crossbred heifers. Archiv Fuer Tierzucht. 37(5): 481-492 As a product innovation to complete veal and commercial beef production, a cereal beef production regime with crossbred heifers was tested to produce quality beef with young animals of low carcass weights. This is consistent with the change in [...]
Breeding strategies for marginal regions in the tropics and subtropics
Valle Zarate, Anne, 1995: Breeding strategies for marginal regions in the tropics and subtropics. Archiv Fuer Tierzucht. 38(5): 461-478 The transferability of methods of animal breeding developed in industrialized countries to marginal regions in the tropics and subtropics is questioned. Approaches of planning of breeding, methods of crossbreeding and possibilities of evaluation and genetic development [...]
Breed differences and genetic parameters for body composition traits in beef cattle
Marshall, Dm, 1994: Breed differences and genetic parameters for body composition traits in beef cattle. Journal of animal science 72(10): 2745-2755 The recent scientific literature was reviewed to summarize breed differences and genetic parameters for carcass traits in beef cattle. Heritability estimates were generally moderate to large, suggesting good potential for accurate genetic selection for [...]
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