test Browse by Author Names Browse by Titles of Works Browse by Subjects of Works Browse by Issue Dates of Works
       

Advanced Search
Home   
 
Browse   
Communities
& Collections
  
Issue Date   
Author   
Title   
Subject   
 
Sign on to:   
Receive email
updates
  
My Account
authorized users
  
Edit Profile   
 
Help   
About T-Space   

T-Space at The University of Toronto Libraries >
University of Toronto at Scarborough >
Bioline International Legacy Collection >
Bioline International Legacy Collection >

Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/22128


Title: Comparative performance of Holstein Friesian and Brown Swiss crosses with zebus in dual purpose production systems in three regions of Venezuela
Authors: López, Jenny
Vaccaro, Lucia
Keywords: Crossbred cows, Holstein Friesian-zebu, Brown Swiss-zebu, productive performance, dual purpose
Vacas cruzadas, Holstein Friesian-cebú. Pardo Suizo-cebú, comportamiento comparativo, doble propósito
Issue Date: 31-Dec-2002
Publisher: Instituto Nacional de Investigaciones Agrícolas Venezuela
Citation: Zootecnia Tropical (ISSN: 0798-7269) Vol 20 Num 3
Abstract: The purpose of the study was to compare the perforrnance of Holstein Friesian- zebu (HFx, n=3256) and Brown Swiss-zebu (PSx,n=2055) crossbred cows on 10 dual purpose farms in three regions of Venezuela, with higher management levels in region 3 (Falcon) than in regions 1 or 2 (Guárico ). Linear models were used to analyze milk yield per lactation (MY). lactation length (LL), calving interval (CI), milk yield per day of calving interval (MY/CI), calf survival (SV) and calf weight (CW). adjusted to 4 months, including the effects of region (R:1,2.3); breed group (BG: l/2 HFx,≥5/8 HFx, 1/2 PSx,≥5/8 PSx); year of calving (Y:1989,.1998); season of calving (S:trimester 1,4); calving number (CN:1,≥2) and the interactions BG x R. BG x CN and BG x S.The adjusted means (± SE)were: MY: 1396±23 kg; LL:253±3 days; CI:460±3 days; MY/CI: 3.3±0,06 kg/day; SV:81,3±0,9% and CW:67,3±0,4 kg. BG significantly (P<0.01) affected MY, LL, IEP and SV, but not MY/CI or CW. The BG x R interaction was significant for MY, LL, CW (P<0,01), and CI (P<0,05). SV of the ≥5/8 HFx was lower than the other groups (P<0,01). independent of region. It was concluded that no BG had a clear productive superiority in regions 1 or 2, and that the advantage ofthe ≥5/8 HFx in MY in region 3 (12-15%,(P<0,01) was not reflected in higher MY/CI and was reduced by their lower SV.
URI: http://hdl.handle.net/1807/22128
Other Identifiers: http://www.bioline.org.br/abstract?id=zt02026
Rights: Copyright 2002 - Zootecnia Tropical. Free full-text also available online at http://www.ceniap.gov.ve/bdigital/ztzoo/ztindice.htm
Appears in Collections:Bioline International Legacy Collection

Files in This Item:

File Description SizeFormat
zt02026.html75.46 kBHTMLView/Open

Items in T-Space are protected by copyright, with all rights reserved, unless otherwise indicated.

uoft