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The effect of spring shearing ... in glucose uptake by the udder in shorn ewes may influence lactose secretion since the blood glucose is the main precursor of milk lactose. Lactose daily output showed a greater decline in the morning milk exhibiting greater post-shearing reduction (Fig. 1). In the afternoon milk daily output of lactose did not differ substantially from the pre-shearing value. Lactose is the major osmotic compound of the milk and an increase of its concentration, proportionally to the post-shearing elevation of other constituents, could lead to an increased osmotic movement of water from blood to the milk. In a nursing ewe, such a raise of daily MY may increase the lamb’s total body water content and thermal conductivity of the peripheral tissues. Therefore, the post-shearing decline in daily MY accompanied by an increase in daily output of milk fat and milk protein may be assumed as an adaptive, anticipatory response improving energy supply to the offspring and its thermoregulatory capacity. The stated changes in milk yield and milk composition may be considered to indicate central pathways in the post-shearing adaptive adjustments including milk synthesis control mechanisms. Conclusion Daily milk yield over the two weeks post-shearing exhibited an average drop of 7.2 % due to the 8.2 and 2.2 %, respectively, reduction in the morning and in the afternoon yields. Milk fat and milk protein concentrations increased compared to the corresponding mean pre-shearing values. Mean daily output of milk fat, milk protein and total solids after shearing increased despite the reduction in daily milk yield, whereas lactose daily output dropped relative to its pre-shearing value The data suggest that post-shearing changes in milk composition make for the improvement of milk processing characteristics. Uticaj prolećne striže na prinos i sastav mleka ovaca rase cigaja Y. Aleksiev Rezime Ocenjivana je reakcija prinosa i sastava mleka na strižu kod cigaja ovaca koje se drže u zatvorenom prostoru. Ovce su dobijale 700g/po grlu dnevno koncentrata i iseckanog sena, ad libitum i mužene su dva puta dnevno - 08:00 i 247
248 Y. Aleksiev 18:00 h. U proseku, za period od dve nedelja nakon striže, dnevni prinos mleka je smanjen za 7.2% zbog 8.2 i 2.2%, respektivno, smanjenja prinosa mleka u jutarnjoj i večernjoj muži. Koncentracije mlečne masti i proteina u jutarnjoj i večernjoj muži 1., 7. i 14. dana nakon striže su bile znatno više od vrednosti pre striže, dok je vrednost koncentracije laktoze pokazao trend smanjenja nakon striže. U tri uzorka uzeta nakon striže, dnevni prinosi različitih konstituenata mleka su nadmašili odgovarajuće srednje vrednosti pre striže za 16.2, 11.6 i 9.1 % kod mlečne masti, 1.6, 3.5 i 6.2 % kod proteina u mleku, i 4.1, 7.2 i 2.2 % kod ukupne čvrste materije. Povećanje dnevne proizvodnje konstituenata mleka se desilo uprkos smanjenju prinosa mleka. Dnevna proizvodnja laktoze, suprotno gore navedenim vrednostima, je pala za 6.9, 7.7 i 9.3 % u odnosu na srednje vrednosti pre striže. Adaptivne modifikacije nakon striže uključujući promene u balansiranju hrane su u osnovi promena u prinosu i sastavu mleka. Može se zaključiti da promene u prinosu i sastavu mleka nakon striže utiču na poboljšanje osobina mleka koje su važne za njegovu preradu. References ALEKSIEV Y. (2008): Effect of shearing on feed intake and milk yield in Tsigai ewes. Bulgarian Journal of Agricultural Science, 2008, 14, 87-92. ALEKSIEV Y. (2009): Milk yield responses to shearing in Bulgarian fine wool breed of sheep. Book of Abstracts, Fourth International Symposium on Livestock production, September 9-12, Struga, Macedonia, 53. ALEKSIEV Y. (2010a): Feed intake and milk yield responses to shearing in Pleven blackhead ewes. Bulgarian Journal of Agricultural Science, 16, (in print). ALEKSIEV Y., GERCHEV G., HRISTOVA TS., DIMOV G. (2010b): Effect of shearing on milk composition in Tsigai ewes. Journal of Mountain Agriculture on the Balkans, 13, 334-343. ALEKSIEV Y. (2010c): Effect of shearing on some productive and physiological traits in sheep of different breeds and categories. Thesis for DSc. Institute of Mountain Stockbreeding and Agriculture, Troyan, 250 p. BENCHINI R., PULINA G. (1997): The quality of sheep milk: a review. Wool Technology and Sheep Breeding, 45, 182-220. CHRISTOPHERSON R. (1985): The thermal environment and the ruminant digestive system. In: Stress Physiology in Livestock. vol. 1. Basic Principles, (ed M K Yousef), SRC Press, Boca Raton, 163-179. KNIGHT T., BENCHINI R., HAACK N., DEATH A. (1993): Effects of shearing on milkyields and milk composition in machine-milked Dorset ewes. New Zealand Journal of Agricultural Research, 36, 123-132.
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UDC 636 ISSN 1450-9156 VOL 27, 2 Fo
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Biotechnology in Animal Husbandry 2
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128 V. Pantelić et al. effects of
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134 V. Pantelić et al. se nalazile
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Table 1. Feeding regime durring the
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The effect of crossing of domestic
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4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 Round
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The effect of crossing of domestic
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148 J. Pleadin et al. are synthesiz
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150 J. Pleadin et al. v/v) were add
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152 Concentration of progesterone (
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154 J. Pleadin et al. Decision 2002
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156 J. Pleadin et al. Koncentacije
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158 J. Pleadin et al. CACCIATORE G.
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160 Efficiency of bovine IGF -I gen
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184 D. Vitorović et al. (Vićentij
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186 D. Vitorović et al. Broilers i
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188 D. Vitorović et al. deposition
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190 D. M. Ogah Blasco et al. (1984)
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192 D. M. Ogah Tabe 1. Descriptive
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194 D. M. Ogah chicken genotypes fo
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Registration fee Registration fee i
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