Your browser doesn't support javascript.
loading
Genetic analysis of the infestation of females of the Caracu cattle breed by Horn Fly (Haematobia irritans irritans) L. (Diptera, Muscidae)
Fraga, Angelina Bossi; Alencar, Maurício Mello de; Figueiredo, Leopoldo Andrade de; Razook, Alexander George; Cyrillo, Joslaine Noely dos Santos Gonçalves.
  • Fraga, Angelina Bossi; Universidade Federal de Alagoas. Centro de Ciências Agrárias. Departamento de Zootecnia. Maceió. BR
  • Alencar, Maurício Mello de; Embrapa Pecuária Sudeste. São Carlos. BR
  • Figueiredo, Leopoldo Andrade de; Instituto de Zootecnia do Estado de São Paulo. Sertãozinho. BR
  • Razook, Alexander George; Instituto de Zootecnia do Estado de São Paulo. Sertãozinho. BR
  • Cyrillo, Joslaine Noely dos Santos Gonçalves; Instituto de Zootecnia do Estado de São Paulo. Sertãozinho. BR
Genet. mol. biol ; 28(2): 242-247, 2005. tab, graf
Article in English | LILACS | ID: lil-416292
ABSTRACT
The objective of this study was to evaluate environmental factors that affect infestation of Caracu cattle breed by horn fly (Haematobia irritans) and to estimate genetic parameters for level of infestation. Infestation was evaluated on females from two herds in two consecutive years. Total number of flies on animals (FC) was counted, an infestation score (FS 1 to 5) was recorded according to the estimated number of flies on animals, and number of parasites in photographs (FF) taken when the animals were evaluated was also counted. On each animal from one to eight observations were taken. A total of 3,836, 2,751 and 3,754 records from 718 animals were obtained for FC, FF and FS, respectively. The incidence of flies was lower during winter and higher during summer, and the thicker the hair coat of the animal the greater the infestation. Heritabilities and repeatabilities were equal to 0.10 and 0.10, 0.08 and 0.12, and 0.06 and 0.08, for FC, FF and FS, respectively. Findings indicate that selection for FC will result in low genetic progress and that animals should be evaluated more than once for selection purposes.
Subject(s)
Full text: Available Index: LILACS (Americas) Main subject: Cattle / Muscidae Limits: Animals Language: English Journal: Genet. mol. biol Journal subject: Genetics Year: 2005 Type: Article Affiliation country: Brazil Institution/Affiliation country: Embrapa Pecuária Sudeste/BR / Instituto de Zootecnia do Estado de São Paulo/BR / Universidade Federal de Alagoas/BR

Similar

MEDLINE

...
LILACS

LIS

Full text: Available Index: LILACS (Americas) Main subject: Cattle / Muscidae Limits: Animals Language: English Journal: Genet. mol. biol Journal subject: Genetics Year: 2005 Type: Article Affiliation country: Brazil Institution/Affiliation country: Embrapa Pecuária Sudeste/BR / Instituto de Zootecnia do Estado de São Paulo/BR / Universidade Federal de Alagoas/BR