Caractérisations quantitative et qualitative des performances laitières des troupeaux bovins menés en hors sol dans une zone littorale semi-aride (Tunisie)

• Main Authors: Amani HOUCHATI, Rafik ALOULOU, Youssef M'SADAK
• Format: Article
• Language: English
• Published: Institut Agronomique et Vétérinaire Hassan II 2016-12-01
• Series: Revue Marocaine des Sciences Agronomiques et Vétérinaires
• Online Access: http://agrimaroc.org/index.php/Actes_IAVH2/article/view/451/408

This article referred to the dairy cattle population of breeders adherents in program of Dairy Control led by the Office of Livestock and Pasture (OEP). The main aim of this study is to evaluate the milk yields (quantity and chemical composition). Data collected from 2006 to 2014 on productive traits (nine herds; n=264 lactations) of Holstein Friesian (HF) dairy cattle in Monastir (semi-arid coastal zone in Tunisia) were used to determine milk yield. These data were from 119 dairy cows/heifers. Data were analyzed using fixed effect analysis of variance. Results showed that milk production and composition were relatively low, with a large variation between animals. The average of milk production is 4963 ± 1520 kg for total production and 14 ± 4 kg for daily production. The means of fat and protein counts were respectively 3.64 ± 0.46% and 2.94 ± 0.26%. Lactation number and lactation length were the main sources of variation affecting the milk yield. Calving year had a significant effect on chemical composition of milk. This confirms the influence of environmental effects on milk constituents. Improving the level of nutrition as well as herd management is required for optimal milk yields and rich chemical composition.