Biotechnology in Animal Husbandry - Institut za Stočarstvo

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Biotechnology in Animal Husbandry 27 (2), p 241-249 , 2011 ISSN 1450-9156 Publisher: Institute for Animal Husbandry, Belgrade-Zemun UDC 636.083.4:637.04 DOI:10.2298/BAH1102241A THE EFFECT OF SPRING SHEARING ON MILK YIELD AND MILK COMPOSITION IN TSIGAI EWES Y. Aleksiev Institute of Mountain Stockbreeding and Agriculture 5600 Troyan, Bulgaria Corresponding author: yordan_aleksiev@yahoo.com Original scientific paper Abstract: Milk yield and milk composition responses to shearing were assessed in Tsigai ewes kept indoors. Sheep was offered 700g/head daily concentrate and chopped hay administered ad libitum and was milked twice daily - at 08:00 and at 18:00 h. Average for the two weeks post-shearing, daily milk yield dropped by 7.2 % due to the 8.2 and 2.2 %, respectively, reduction in the morning and in the afternoon milk yields. Fat and protein concentrations in the morning and in the afternoon milk on day 1, day 7 and day 14 after shearing surpassed vastly pre-shearing values whilst milk lactose concentration showed a trend towards postshearing reduction. On the three sampling post-shearing days daily output of different milk constituents exceeded the corresponding mean pre-shearing values by 16.2, 11.6 and 9.1 % in milk fat, 1.6, 3.5 and 6.2 % in milk protein, and 4.1, 7.2 and 2.2 % in total solids. The increase in daily output of milk constituents occurred despite the decline in daily milk yield. Lactose daily output, on the contrary, dropped by 6.9, 7.7 and 9.3 % relative to the mean pre- shearing value. Postshearing adaptive adjustments including changes in nutrient partitioning appear to underlie the alterations in milk yield and milk composition. It may be concluded that post-shearing changes in milk composition makes for the improvement of milk processing characteristics. Key words: sheep, shearing, milk yield, milk composition Introduction Shearing is the common farm routine working disturbances in the thermal homeostasis which brings into action various adaptive responses related to its readjustments. Post-shearing metabolic and endocrine adaptations would be expected to influence plasma concentration of metabolites and alter nutrient partitioning that may affect milk yield and milk composition (McBride and Christopherson, 1984; Symonds, et al., 1990). These changes in milk performance may affect energy supply to the offspring and/or processing characteristics of the milk that may,
242 Y. Aleksiev ultimately, influence the financial performance in dairy farms. In the literature reviewed scarce information was found about shearing effect on milk yield and milk composition in sheep. The aim of the present study was to elucidate the shearing effect on milk yield and milk composition in Tsigai ewes. Materials and Methods Six Tsigai sheep in their 4 th month of lactation were involved in the study. Daily ration consisted of 700 g/head concentrate, given in two meals, and chopped hay administered ad libitum. Water and salt were freely available. Ewes were shorn at mid-April and were hand milked twice a day at approximately 08:00 h and 18:00 h. Sheep was shorn soon after the morning milking. Milk yield from each ewe was recorded and daily yield was obtained by summing the morning and afternoon yield. Samples for milk composition analysis were taken from the milk of each sheep obtained in the morning and in the afternoon milking on the day before shearing, and on day 1, day 7 and day 14 thereafter. The samples were analyzed for fat, protein, and lactose content using a Milko Scan 133 B, calibrated for sheep milk. Mean daily output of milk constituents in the morning and in the afternoon milk at sampling days was also calculated. Feed and water intake and air temperature in the barn were also recorded twice a day. The results are presented as mean and standard error of the mean. Significant differences in daily milk yield, concentration and daily output of milk constituents in the milk obtained before and after shearing of ewes were assessed by a Student’s t test using the mean value for each trait (Snedecor and Cochran, 1989). Results and Discussion Mean daily MY in unshorn sheep averaged 604.2 ± 3.5 g/day. The greatest fall in daily yield occurred on day 2 after shearing when it dropped to 85.2 % (P < 0.01) of the mean pre-shearing value (Figure 1). Daily MY increased gradually thereafter nearing the pre-shearing level on the sixth day after fleece removal. Afternoon MY showed a sharp, short-term, decline followed by fast recovering. Average for the two weeks post-shearing, daily MY dropped by 7.2 % due to the 8.2 and 2.2 %, respectively, reduction in the morning and in the afternoon milk yields (Figure 1).
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UDC 636 ISSN 1450-9156 VOL 27, 2 Fo
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PETROVIĆ D.M., GUTIĆ M., BOGOSAVL
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