Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Soudan → The Performance of Holstein-Friesian Cattle Under Sudan Conditions

University of Khartoum (2004)

The Performance of Holstein-Friesian Cattle Under Sudan Conditions

ZEIN ELABDEEN, AMANI

Titre : The Performance of Holstein-Friesian Cattle Under Sudan Conditions

Auteur : ZEIN ELABDEEN, AMANI

Université de soutenance : University of Khartoum

Grade : Master of Science (MS) (Animal breeding) 2004

Résumé partiel
This study was conducted to investigate the reproductive and productive performance and to estimate some genetic parameters of these traits in Holstein- Friesian cattle at Dairy Land Farm in Sudan. Data of the first four lactations covering the period from 1986 to 2002 was studied and subjected to statistical analyses using Harvey’s least – squares computer programme (1990). The least squares means for age at first calving, calving interval, service period, number of services per conception, lactation milk yield, daily milk yield, lactation length and dry period were 29.762±0.395 months, 433.117±6.699 days, 167.785±7.084 days, 2.348±0.107, 3475.526±78.889 kg , 12.29±0.279 kg , 294.104±3.622 days and 164.075±6.699 days, respectively. The analysis of variance revealed that the sire had a highly significant (P<0.001) effect on number of services per conception, lactation milk yield and daily milk yield. The effect of sire on lactation length was highly significant (P<0.01), and there was a significant (P<0.05) effect of sire on service period. The calving year-season had a highly significant effect (P<0.001) on age at first calving, lactation milk yield , daily milk yield and lactation length. Parity had a highly significant (P<0.001) effect on service period, number of services per conception, lactation milk yield and daily milk yield. It also had a significant (P<0.05) effect on calving interval and dry period. Linear and quadratic regressions on lactation length had a significant (P<0.001) effect on lactation milk yield and daily milk yield. Linear regression on lactation length had a highly significant (P<0.001) effect on calving interval 7 and dry period.

Présentation -> http://khartoumspace.uofk.edu/handl...

Version intégrale (0,38 Mb)

Page publiée le 8 mai 2020