Factors affecting the milk yield and composition over lactation of prolific D'man ewes in Tunisian oases

Tropical Animal Health and Production
Amel DhaouiMohamed Hammadi

Abstract

This work aimed to investigate milk potentiality and the influence of some non-genetic factors both on milk yield production and composition in prolific D'man sheep. Observations were performed in eighty lactating D'man ewes maintained under an intensive oases system in Southern Tunisia. Daily milk yield was determined at 7-day intervals using oxytocin + hand milking method. Chemical milk composition was determined by Lactoscan. Total productions over lactation (milk, fat, and protein) were estimated using the Fleischmann method. Daily milk yield averaged 1.64 ± 0.02 l. It increased to a plateau from the third to the fourth week of lactation, and decreased gradually to the tenth week. D'man ewes produced 128.91 ± 3.14 l of milk, 9.23 ± 0.26 kg of fat, and 5.26 ± 0.12 kg of total proteins. Overall, milk contained 16.17% of total solids, 7.08% of fat, 4.04% of proteins, 4.32% of lactose, 9.09% of solids-not-fat, and 0.73% of ash. Lambing season affected the daily milk yield and milk composition, where fat and total proteins were highest in autumn. Total solids, lactose, solids-not-fat, and ash were higher in winter than in autumn and summer. Ewes reared multiple lambs produced more milk than those reared singles. Dams nursing tri...Continue Reading

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Citations

Jun 17, 2020·Animal : an International Journal of Animal Bioscience·A DhaouiM Hammadi
Apr 5, 2020·Animals : an Open Access Journal From MDPI·Darwin Arcos-ÁlvarezAlfonso Chay-Canul
Dec 5, 2021·Tropical Animal Health and Production·Zahran KhaldiMohamed Tabarek Jilani

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