Post-shearing management and milk production and quality in Sarda ewes

The aim of this research was to evaluate the effect of ewes management during the post-shearing period on milk
production and quality.
Forty-eight 2-4-year-old Sarda ewes, in mid-late lactation, were used. The trial lasted from 30thMay to 9thJune
2006. The pre-experimental period was from 30thMay to 5thJune (shearing day), followed by the experimental period
until 9th June. On shearing day, the flock was divided in two groups (24 ewes each) which then received a different
management: non confined group (NCG) and confined group (CG) kept in a sheepfold during the night. Four
samplings during pre-shearing (PrS) and other four during post-shearing (PoS) periods were performed. During the
trial, ewes were fed 1000 g/head/d of concentrated food, provided during the two daily milking, and hayad libitum,
and grazed on green clover (3 h/day). Daily milk production was recorded and daily milk samples were collected for
fat, total nitrogen, SCC, casein and urea analyses. Data were analysed by PROC MIXED of SAS software, using
management (M), shearing (S) and their interaction as fixed factors, ewes within group as random factor and the
first sampling of the PrS period as covariate. Environmental conditions during the trial were variable, especially
during PrS when rainfall occurred 2 days before shearing. Maximum and minimum temperatures were, on average,
23±3.3 °C and 9±1.6 °C, respectively. Sheep confinement after shearing did not influence milk yield and quality.
On the contrary, shearing influenced fat, casein and urea content within each management group. Indeed, fat
and casein were higher (P<0.01) and urea was lower (P<0.01) during the PoS than during the PrS period: for NCG,
fat (%) 7.32vs6.90, casein (%) 4.29vs4.14, urea (mg/dl) 53vs61; for CG, fat (%) 7.36vs6.97, casein (%) 4.24vs4.17, urea (mg/dl) 52vs59. In conclusion, late-Spring shearing has positive effects on milk quality in dairy sheep,
as observed in meat breed. Differently, sheep confinement after shearing has not effect on milk traits, in spite of
highly variable environmental conditions. The fact that shearing can improve milk quality of Sarda ewes encourages
further studies on the effects of shearing earlier than usual, i.e. in mid Spring.