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Lines of Merino sheep selected for increased (IRH) and decreased (DRH) resistance to Haemonchus contortus were compared with an unselected (CH) line, after approximately four generations of selection. Measurements were recorded on 69 IRH, 47 DRH and 84 CH animals. Following artificial challenge with H. contortus, the IRH line had significantly (P less than(More)
Candidate genes for quantitative trait loci have been studied in a Medium Peppin Merino flock. Obvious candidates for effects on wool production traits are genes for the major proteins expressed in the wool fibre, the keratin and keratin-associated protein genes. Two keratin-associated protein loci, KRTAP6 and KRTAP8, have previously been shown to be(More)
Basal plasma concentrations (four 30-min samples) and GnRH-induced release of gonadotrophins were measured every 15 days between 30 and 90 days and at 110 days of age in Merino ewe lambs from the prolific Booroola ('B') flock (n = 18-23), the medium prolificacy ('T') flock (n = 14-20), and the 'O' flock (n = 4-8) of low prolificacy. At ages of 30 and 45(More)
Ewes were immunized with four inhibin preparations of increasing purity obtained from bovine follicular fluid by affinity chromatography. The two purest immunogens, which had 69 and 174 ng inhibin micrograms-1 protein (expressed in terms of 32 kDa ovine inhibin), increased ovulation rate by 240 and 320% respectively following two injections, and gave a(More)
To determine whether the high ovulation rate of the Booroola Merino ewe could be explained by FSH metabolism we have tested the proposition that FSH may have a longer half-life in the plasma of Booroola Merino ewes than in control ewes. The half-life of plasma FSH was determined by removal of the pituitary gland, to abolish FSH secretion into the peripheral(More)
In the last few years there has been an increasing interest in using traditional animal breeding techniques to improve important traits such as growth rate in freshwater crayfish. However, a major impediment to such programs is an inability to reliably identify individuals or family groups for long periods because of the non-retention of external tags(More)
The ovine hair keratin-associated protein (KRTAP) genes are grouped into several families. In this study, we analyzed linkage relationships between members of four KRTAP families and growth hormone and beta-hemoglobin. Restriction fragment length polymorphisms and a microsatellite polymorphism were typed in 10 sire groups from a flock of Australian Merino(More)