medigraphic.com

1993, Number 3

<< Back Next >>

Vet Mex 1993; 24 (3)

Fertility, prolificacy and lamb survival in a commercial flock of Suffolk sheep

Bonilla ALM, Torres HG, Rubio RM

Language: English/Spanish
References: 23
Page: 231-234
PDF size: 71.75 Kb.


Text Extraction

An investigation was carried out with 2,008 observations from production records of a commercial flock of Suffolk sheep located in Huehuetoca, State of Mexico, in order to determine the effect of some environmental factors on percentages of ewe fertility (PF), ewe prolificacy (PP) and lamb survival (PS). Overall least-squares means for PF, PP and PS were 72.5±7.0%, 141.3±7.5% and 77.5 ± 7.8%, respectively. Year of lambing significantly (P ‹ 0.01) influenced the variation of PF, PP and PS. PF showed a gradual tendency to increase during the years included in this study, whereas an irregular pattern was found in PP and PS. Age of the ewe was another factor that significantly (P‹ 0.01) influenced the same variables. A curvilinear effect was found for PF (with a peak of 83.9% in the six-year-old ewes) and PS (with a peak of 81.3% in the five-year-old ewes) with an irregular pattern in PP. Twin lambs survived more at weaning that single lambs (79.7 vs 75.8%), but this was not a significant difference (P › O.O5).


REFERENCES

  1. Barker, J.D.: A field trial of Finnish Landrace rams as sires of crossbred ewes. Anim. Prod., 20: 371-377 (1975).

  2. Bradley, B.P., Chapman, A.B., Pope, A.L. and Rydberg, C.O.: Two-and rhree-way crosses estimating combining ability of Suffolk, Targhee and Shropshire breeds of sheep, J. Anim. Sci., 34: 541-548 (1972).

  3. Branford-Oltenacu, E.A. and Boylan, W.J.: Productivity of purebred and crossbred Finnsheep. I. Reproductive traits of ewes and lamb survival. J. Anim. Sci., 52: 989-997 (1981).

  4. Carter, A.A. and Kirton, A.H.: Lamb production performance of 14 sire breeds mated to New Zealand Romney ewes. Livestock Prod. Sci., 2: 157-166 (1975).

  5. Cervantes, B.F., Torres, H.G. y García, W.M.:Algunos caracteres de producción hasta el destete de corderos Suffolk en el Valle de México. Rev. Chapingo, 43-44: 172-176 (1985).

  6. Dalton, D.C., Knight, T.W. and Johnson, D.C.: Lamb survival in sheep breeds on New Zealand hill country. New Zealand J. Agr. Res., 23: 167-173 (1980).

  7. Dickerson, G.E. and Glimp, H.A.: Breed and age effects on lamb production of ewes. J. Anim. Sci., 40: 397-408 (1975).

  8. Dzakuma, J.M., Stritzke, D.J. and Whiteman, J.V.: Fertility and prolificacy of crossbred ewes under two cycles of acce1erated lambing. J. Anim. Sci., 54: 213-220 (1982).

  9. García, E.: Modificación al Sistema de Clasificación Climática de Kóppen, Instituto de Geografia, Universidad Nacional Autónoma de México, México, D.F., 1973.

  10. Hohenboken, W.D. and Clark, S.E.: Genetic, environmental and interaction effects on lamb survival, cumulative lamb production and longevity of crossbred ewes. J. Anim. Sci., 53: 966-976 (1981).

  11. Hohenboken, W., Corum, K. and Bogart, R.: Genetic, environmental and interaction effects in sheep. I. Reproduction and lamb production per ewe. J. Anim. Sci., 42: 299-306 (1976).

  12. Lara, P.J., Gutiérrez, Y.A. y Lucas de, T.J.: Parámetros productivos y reproductivos de una explotación comercial Suffolk. Memorias del III Congreso Nacional de Producción Ovina. Tlaxcala, Tlaxcala, México. 1990. 121-124. Asociación Mexicana de Técnicos Especialistas en Ovinocultura. Tlaxcala, Tlax., México (1990).

  13. Magid, A.F., Swanson, V.B., Brinks, J.S., Dickerson, G.E. and Smith, G.M.: Border Leicester and Finnsheep crosses. II. Productivity of F1 ewes. J. Anim. Sci., 52: 1262-1271 (1981).

  14. Notter, D.R. and Copenhaver, J.S.: Performance of Finnis Landrace crossbred ewes under accelerated lambing. I. Fertility, prolificacy and ewe productivity. J. Anim. Sci., 51: 1033-1042 (1980).

  15. Salas, J.J.: Explotación de ovinos para cría a nivel comercial. Memorias del Primer Encuentro Nacional sobre Producción de Ovinos y Caprinos. Comisión de Desarrollo Agropecuario del Gobierno del Estado de México-Secretaría de Agricultura y Recursos Hidraúlicos. Metepec, Estado de México. 1981. 92-96. Facultad de Estudios Superiores de Cuautitlán. Universidad Nacional Autónoma de México. México, D.F. (1981).

  16. SAS: SAS User's Guide: Statistics. 5th ed. SAS Institute Inc., Cary, North Carolina, 1985.

  17. Sidwell, G.M., Everson, D.O. and Terril, C.E.: Fertility, prolificacy and lamb livability of some pure breeds and their crosses. J. Anim. Sci., 21: 875-882 (1962).

  18. Sidwell, G.M. and Miller, L.R.: Production in some pure breeds of sheep and their crosses. I. Reproductive efficiency in ewes. J. Anim. Sci., 32: 1084-1089 (1971).

  19. Steel, R.G.D. and Torrie, J.H.: Principies and Procedures of Statistics: A Biometrical Approach. 2nd ed. McGraw-Hill, New York,1980.

  20. Trejo, G.A. y Lucas de, T.J.: Comportamiento reproductivo de rebaños Suffolk en el altiplano mexicano. Memorias del 1er Congreso Nacional de Producción Ovina. Calera, Zacatecas, México. 1988. 133-135. Asociación Mexicana de Técnicos Especialistas en Ovinocultura, Calera, Zac., México (1988).

  21. Turner, H.N. and Young, S.S.Y.: Quantitative Genetics in Sheep Breeding. MacMillan, Melbourne, Australia, 1969.

  22. Uribe, M.J., Oviedo, F.G. y Hernández, V.C.: Eficiencia productiva y reproductiva de 10 rebaños ovinos, bajo un sistema de empadre contínuo en el municipio de Ajacuba, Estado de Hidalgo, México. Memorias del III Congreso Nacional de Producción Ovina. Tlaxcala, Tlaxcala, México. 1990. 125-128. Asociación Mexicana de Técnicos Especialistas en Ovinocultura. Tlaxcala, Tlax. México (1990).

  23. Wiener, G.D., Deeble, F.K., Broadbent, J.S. and Talbot, M.: Breed variation in lambing performance and lamb mortality in commercial sheep flocks. Anim. Prod., 17: 229-235 (1973).




2020     |     www.medigraphic.com