Dairy Sheep Symposium - the Department of Animal Sciences ...

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Casu S. and Sanna S. (1990). Aspetti e problemi del miglioramento genetico della composizione del latte di pecora e di capra (Aspects and problems of genetic improvement of the composition of milk from sheep and goats). Proceedings of the Second International Symposium "Nuove prospettive della ricerca sugli ovi-caprini" Varese (Italy), 23 November 1990, 171-195. Dawe S.T. (1990). The sheep dairying industry In 'Sheep Medicine' The Post Graduate Committee in Veterinary Sciences, University of Sydney, NSW July 1990. Dawe S.T. and Langford C.M. (1987). The development of a NSW sheep dairying industry. In 'Proceedings of the Sheep and Wool Seminar and Refreshers Course', N.S.W. Department of Agriculture, Goulburn, April 1987 32, 1-11. Epstein, H. (1982). Awassi Sheep. World Animal Review 44, 9-18. Epstein, H. (1985). "The Awassi Sheep with Special Reference to the Improved Dairy Type". FAO Animal Production and Health Paper 57, FAO, Rome. Eyal E. and Goot H. (1969). Vital statistics and milk and lamb production of F1 ewes (Awassi x East Friesian) under farm conditions. Animal Breeding Abstracts 37, 459. Flamant J.C. and Barillet F. (1982). Adaptation of the principles of selection for milk production to milking ewes: a review. Livestock Production Science 9, 549-559. Flamant J.C. and Morand-Fehr P.C. (1982) Milk production in sheep and goats. In 'Sheep and Goat production' (Ed. I.E. Coop) World Animal Science C.I., Elsevier 15, 275-295. Kervina F., Sagi R., Hermelin R., Galovic B., Månsson S., Rogelj I., Sobar B., Franken M. and Ödman M. (1981). System solutions for dairy sheep. Alfa Laval AB Tumba, Sweden Knight T.W., Atkinson D.S., Haack N., Palmer C.R. and Rowland K.H.. (1993). Effects of suckling regime on lamb growth rates and milk yields of Dorset ewes. New Zealand Journal of Agricultural Research 36, 215-222. Lightfoot J. (1987). The Awassi fat tail sheep project. Journal of Agriculture 4,107-113. Mills O. (1989). Practical sheep dairying: the care and the milking of the dairy ewe. Thorsons Publishing Group, Wellingborough, England pp 1-320. Treacher T.T. (1987). Milk. In "New techniques in sheep production" (Ed. Marai I.F.M. & Owen J.B.) Butterworths, London. 25-33
GROUP BREEDING SCHEME: A FEASIBLE SELECTION PROGRAM Yves M. Berger Spooner Agricultural Research Station University of Wisconsin-Madison Spooner, Wisconsin Introduction Every flock owner practices some sort of selection on his/her flock by keeping ewe lambs or ram lambs from their best ewes for the trait(s) they have chosen. In traditional sheep flocks the selection criteria most often chosen by producers are prolificacy, growth, out of season lambing, easy care sheep, etc… In a dairy sheep flock, selection is done on milk production, milk composition, udder morphology, milk let down, etc… In other words we all want the perfect sheep that is high producing with the least amount of work at the least cost. Real genetic progress in individual small to medium size flocks is, generally, not forthcoming because of ill chosen traits to improve (or too many), small number of animals to choose from and inaccuracy of the estimated genetic value of the animal selected. A quick reminder of genetic principles might help understand the reasons for the poor or no results from an individual flock selection program. Genetic review Two terms are absolutely indispensable to understand: Heritability. Heritability (h 2 ) is the proportion of phenotypic differences between animals which is due to additive genetic differences. Simply put, it is the proportion of parent superiority observed in the progeny. In general reproductive traits have a low heritability while growth, carcass traits, fiber traits and milk production have a medium heritability. The following table gives a few examples of heritabilites in sheep: Prolificacy 10% Lamb survival 5% 90-day weight 25% Loin eye area 50% Fiber diameter 40% Milk yield 30% Milk Fat percentage 35% Milk Protein percentage 40% The higher the heritability, the quicker the selection will be. In sheep, dairy traits have a moderate heritability, which means that significant genetic improvement can be achieved.
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Proceedings of the 7 th Great Lakes
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ORGANIZING COMMITTEE 7 TH GREAT LAK
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Thursday, November 1 Noon Registrat
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SPEAKERS Dr. Juan-José Arranz, Dpt
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Table of Contents (continued) Lates
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eeding and were created to have hig
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Disease in the U.K. and subsequentl
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sheep production conditions in Wisc
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Pinelli, F., P. A. Oltenacu, G. Ian
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Bucket milking and elevated platfor
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Throughputs in different parlors No
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1 - Stand up as straight as possibl
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Roques J.L.. 1997. Traite des brebi
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Grade B milk quality is as follows:
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(c) Not Applicable (d) At least 10
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TOILET AND WATER SUPPLY 7. Toilet (
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(c) Drugs and medicinals shall be l
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FARMSTEAD CHEESE AND MARKETING Stev
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5. Cheese is delivered in person, w
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to participate with us, we are enga
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The key points to this plan were: Y
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Milk is supplied in two major forms
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MANAGEMENT OF A DAIRY SHEEP OPERATI
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4 3.5 3 2.5 2 1.5 1 0.5 Chart 1: Mi
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Facilities and Equipment The requir
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from the ewes at 12 to 24 hours of
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COMPARISON OF EAST FRIESIAN AND LAC
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two-year-olds in 2001. East Friesia
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Reproduction. Table 4 compares the
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six ewes were sired by Lacaune ram
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FACTORS AFFECTING THE QUALITY OF EW
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Sheep Genetic factors breed and gen
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Genetic factors The breed and genot
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Physiological factors affecting she
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Management factors affecting the qu
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sheep with one peak of milk ejectio
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An important aspect of dietary fibr
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References Alais C. (1974). Science
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Bufano G., Dario C. and Laudadio V.
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Cowan R.T., Robinson J.J., McHattie
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Folman Y., Volcani R. and Eyal E. (
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Kalantzopoulos G. (1994). Influence
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McHattie I., Fraser C., Thompson J.
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Peart J.N. (1970). The influence of
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Ranieri M.S. (1993). La variazione
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Treacher T.T. (1970). Effects of nu
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EVALUATION OF SENSORY AND CHEMICAL
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ing, the cheeses were brined for 18
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The FFA concentrations generally in
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Table 1. Composition of pasteurized
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Table 6. Body and texture scores 1
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Present Development of Selection Sc
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Breed Usage in Europe Crossbreeding
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nearly 1. As a consequence this cha
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Table 5. Repeatabilities and phenot
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percentage is not expected to resul
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Improved AI technique Artificial in
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Identifying major genes or QTL rela
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Figure 5. Half-sib families and QTL
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In the case of cheese the problem i
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Emanuelson, U., Danell, B., Philips
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Rothschild, M. F., Soller, M. (1997
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teat placement in dairy ewes (Fern
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that of the average milking time. M
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1988) and active expulsion of fat f
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References Barillet, F., and F. Boc
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Table 1. Least squares means ± SEM
Page 136 and 137: Table 3. Simulation of parlor throu
Page 138 and 139: EFFECT OF REDUCING THE FREQUENCY OF
Page 140 and 141: Individual ewe milk production (mor
Page 142 and 143: dimanche soir sur les brebis de rac
Page 144 and 145: A B A Morning milk yield, kg B Adj.
Page 146 and 147: Background and History: Most sheep
Page 148 and 149: Percent 100 80 60 40 20 0 87 Effect
Page 150 and 151: Fall Lambing Percentage 100 90 80 7
Page 152 and 153: THE EFFECT OF GROWTH RATE ON MAMMAR
Page 154 and 155: After puberty, the mammary gland re
Page 156 and 157: Many trials have examined the mamma
Page 158 and 159: From these results the authors conc
Page 160 and 161: Onset of Puberty and Reproductive P
Page 162 and 163: Similarly, calves, heifers, and cow
Page 164 and 165: McCann, M. A., Goode, L., Harvey, R
Page 166 and 167: DISCUSSION Stability of Frozen Raw
Page 168 and 169: analyzed for titratable acidity, sy
Page 170: 411-416. Wendorff, W.L. 1998. Updat
Page 175 and 176: Recent Outbreaks involving Cheddar
Page 177 and 178: testing on raw milk at the farm. Th
Page 179 and 180: THE AUSTRALIAN SHEEP DAIRY INDUSTRY
Page 181 and 182: The University of Western Australia
Page 183 and 184: Heterosis did not seem to intervene
Page 185: Lambs The problem of weaning lambs
Page 189 and 190: Where: h = square root of heritabil
Page 191 and 192: Second step. All members enroll in
Page 193 and 194: The structure and movement of anima
Page 195 and 196: CAN THE OVARY INFLUENCE MILK PRODUC
Page 197 and 198: dividing the amount of milk obtaine
Page 199 and 200: the CL there were significant diffe
Page 201 and 202: etween milkings. Finally, this woul
Page 203 and 204: Table 1. Least squares means ± SEM
Page 205 and 206: A Daily milk yield (kg) A B Milk fl
Page 207 and 208: Progesterone (ng/ml) 8 6 4 2 0 CLY:
Page 209 and 210: milk volume within the cistern (Mar
Page 211 and 212: Results Treatment milk yield increa
Page 213 and 214: Reports in dairy cattle concerning
Page 215 and 216: Muir, D.D., D.S. Horne, A.J.R. Law,
Page 217 and 218: Milk yield (kg) 1.4 1.2 1.0 0.8 0.6
Page 219 and 220: A Milk protein (%) A A Milk protein
Page 221 and 222: TAPPE FARM TOUR Jon & Kris Tappe, T
Page 223: a little special attention every da
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