Blowfly strike of Merino sheep in relation to selection strategy, as well as to objective and subjective wool traits
نویسندگان
چکیده
395 Blowfly strike of Merino sheep in relation to selection strategy, as well as to objective and subjective wool traits S.W.P. Cloete, J.J. Olivier and E. du Toit Animal Production Division, Elsenburg ADC, Private Bag X1, Elsenburg 7607, South Africa. Irene Animal Improvement Institute, Private Bag X529, Middelburg 5900, South Africa. Tygerhoek Experimental Farm, PO Box 25, Riviersonderend 7250, South Africa. Email: [email protected]
منابع مشابه
Genetic Relationships between Indicator Traits for Fly Strike Resistance and Production Traits in Merino Sheep
Fly strike in sheep has been estimated to cost the Australian sheep industry approximately $280m dollars annually (Sackett et al. 2006) as a result of sheep losses, cost of treatment and loss of wool and carcase production and value. Historically Australian sheep producers have surgically removed skin from around the tail (mulesing) to help avoid fly strike. Although this has proved highly succ...
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Blowfly strike and the methods used to combat blowfly strike were recorded on 33 properties in the Rûens area of South Africa during 2003/2004. Data were recorded on Merino and Dohne Merino hoggets (n = 4951) with at least 3 months' wool growth. The following data were captured: presence or absence of strike, site of the strike (body or breech), presence or absence of dermatophilosis as well as...
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Using pedigree and performance records obtained from two Merino breeders the phenotypic and genetic relationship between subjectively assessed sheep and wool traits and objectively measured wool traits were estimated. The subjective traits were all favourably genetically correlated with fibre diameter. The genetic relationship with body weight, greasy fleece weight and fibre diameter variation ...
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Domestication and selection are processes that conserve the pattern of genetic diversities between and within populations. Identification of genomic regions that are targets of selection for phenotypic traits is one of the main aims of research in animal genetics. An approach for identifying divergently selected regions of the genome is to compare FST values among loci to estimate the genetic v...
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Field studies were conducted in Australia to determine the efficacy of CLiK® Spray-On (50 g/L dicyclanil) in protecting unmulesed sheep from naturally occurring blowfly strike. Unmulesed sheep were treated on day 0 and inspected for flystrike at defined intervals thereafter. Any strikes detected were documented and resolved with a flystrike dressing. In the interest of animal welfare, untreated...
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