HAIRCOAT CHARACTERISTICS AND TICK INFESTATION ON GYR (ZEBU) AND CROSSBRED (HOLSTEIN X GYR) CATTLE(CARACTERÍSTICAS DE LA CAPA E INFESTACIÓN DE GARRAPATAS EN BOVINOS GYR (CEBÚ) Y MESTIZOS (HOLSTEIN X GYR))

Abstract
The following haircoat characteristics, coat thickness (CT), hair density (HD), hair length (HL), and Boophilus microplus tick infestation (T) were measured on purebred Gyr (zebubreed) and crossbred Gyr x Holstein (H) cows and the correlation between these traits were determined. The genetic groups were defined as: GG1= Gyr, GG2= crossbred with 50 to 75 p. 100 Holstein breed and GG3= crossbred with more than 75 p. 100 Holstein. The average means for GG1, GG2 and GG3 were, respectively: CT: 2.68 ± 0.34mm, 2.68 ± 0.47mm, 2.95 ± 0.44mm
HD: 1,140.62 ± 289.14, 971.62 ± 292.48, 1,071.90 ± 237.48 (hairs/cm2)
HL: 4.68 ± 1.22mm, 6.81 ± 1.81mm, 8.74 ± 2.22mm
T: 0.47 ± 0.91, 47.39 ± 54.60, 72.35 ± 45.78. Correlation coefficients were positive and significant between T, HL, CT, as well as between genetic group with T, HL and CT.
Resumen
En la raza cebuína pura Gyr y su cruce con Holstein (H) se midió el espesor de la capa (CT), la densidad de pelo (HD), la longitud del pelo HL y la infestación por la garrapata Boophilus microplus (T) determinando la correlación entre esas características de la capa. Los grupos genéticos fueron definidos como GG1= Gyr, GG2= cruce con 50 a 75 p.100 de Holstein y GG3= cruce con más del 75 p.100 de Holstein. Las medias para GG1, GG2 y GG3 fueron respectivamente: CT: 2,68±0,34mm, 2,68 ± 0,47 mm, 2,95 ± 0,44 mm
HD: 1140,62 ± 289, 14, 971,62 ± 292,48, 1071,90 ± 237,48 (pelos/cm2)
HL: 4,68 ± 1,22 mm, 6,81 ± 1,81 mm, 8,74 ± 2,22 mm
T: 0,47 ± 0,91, 47,39 ± 54,60, 72,35 ± 45,78. Los coeficientes de correlación fueron positivos y significativos entre T, HL, CT así como entre el grupo genético y T, HL y CT.