Structural modeling to improve the organization and control of the reproduction in dairy cattle systems
Abstract
In order to obtain a structural model that allows making decisions to improve the organization and control of reproduction in dairy cattle systems data were collected monthly for the period January 1982 - December 2005 of six dairy cattle companies, in Camagüey province,. Total of females in reproduction (HR), inseminated cows (PENDIEN), post partum cows (RECENT), anoestrus cows (VACITOT), heifers (INCOR), culled cows (BAJAS), cows detected in the first oestrus (RECPRI) and overall oestrus (RECTOT), pregnant cows (GESTDIA) and no pregnant cows (VACDIAG) at diagnosis, and total of births (NACIM) were collected monthly. The technique SEM (structural equation modelling) was used to determine direct causal relationships of interdependence between the variables with lags related to births. The structural analysis yielded a fitted model in which impacts of all explanatory variables were estimated considering all the effects with high reliability (high R2) that had not been previously reported in papers published in Cuba. The validity of relations with the lagged variables delayed six months: pregnant cows (0.43) and no pregnant cows at diagnosis (0.23), and nine months: in the first oestrus (0.28) and total oestrus (0.20), and inseminated (0.20) was confirmed, highlighting the impact of RECTOT10 (0.39) which is a not evident relationship in the system. The application of these results will allow making decisions to improve the organization of the reproduction in dairy cattle systems.
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References
BATISTA-FOGUET, J. M., Y COENDERS, G. (2000). Modelos de ecuaciones estructurales Modelos para el análisis de relaciones causales. La Muralla-Edit. Hespérides ed. BERTOT, J. A., VAZQUEZ, R., DE LA TORRE, R., Y COLLANTES, M. (2006a). Estimación de los nacimientos y las pérdidas económicas por baja eficiencia reproductiva en rebaños lecheros. Rev. Prod. Anim, 18 (2), 145-148. BERTOT, J. A., VAZQUEZ, R., AVILES, R., DE ARMAS, R., GARAY, M., LOYOLA, C., et al. (2006b). Comportamiento reproductivo en empresas pecuarias lecheras de la provincia de Camagüey. Resultados preliminares. No publicados. BERTOT, J A.; R. VAZQUEZ, R. AVILES, R. DE ARMAS, MAGALY GARAY, C. LOYOLA. Y M.
HORRACH. (2009). Relaciones de dependencia temporal entre las variables de organización y control de la reproducción en sistemas lecheros. Rev. Prod. Anim, 21 (1), 89-93. BERTOT, J. A., VÁZQUEZ, R., DE ARMAS, R., GARAY, MAGALY., AVILÉS, R. B., TEJEDA, E., LOYOLA, C. Y HORRACH, M. (2008). Determinación de las variables más representativas para la organización y el control de la reproducción en sistemas vacunos lecheros. Rev. prod. Anim, 20 (1), 65-71. BETANCOURT, J. A., BERTOT, J. A., VÁZQUEZ, R., ACOSTA, A. Y AVILÉS, R. (2005). Evaluación de la fertilidad postparto en rebaños bovinos lecheros de la provincia de Camagüey. Rev. Prod. Anim, 17 (1), 61-66. BYRNE, B. M. (2001). Structural Equation Modelling with AMOS. Basic Concepts, Applications and Programming. New Jersey. CORREA, M. T., CURTIS, C. R., ERB, H. N., SCARLETT, J. M. AND SMITH, R. D. (1990). An Ecological Analysis of Risk Factors for Postpartum Disorders of Holstein-Friesian Cows from Thirty-Two New York farms. J. Dairy Sci, 73 (6), 1515-1524. CURTIS, C. R., ERB, H. N., SNIFFEN, C. J., SMITH, R. D. AND KRONFELD, D. S. (1985). Path Analysis of Dry Period Nutrition, Postpartum Metabolic and Reproductive Disorders and Mastitis in Holstein cows. J. Dairy Sci, (68), 2347. DE LA TORRE, R., BERTOT, J. A., COLLANTES, M. Y VAZQUEZ, R. (2006). Análisis integral de la relación reproducción-produccióneconomía en rebaños bovinos lecheros en las condiciones de Camagüey., Cuba. Estimación de las pérdidas económicas. Rev. Prod. Anim, 18 (1), 83-88. DISKIN, M. G. AND SREENAN, J. M. (2000). Expression and Detection of Oestrus in Cattle. Reprod. Nutr. Dev, (40), 481-491. ENEVOLDSEN, G. y GRÖHN, Y. T. (1996). Methodology for Assement of the HealthProduction Complex Indairy Herds to Promote Welfare. Acta. Agric. Scand. Sect. A. Anim. Sci, Suppl (27), 86-90. ERB, H. N. y MARTIN, S. W. (1981). Interrelationships between Production and Reproductive Diseases in Holstein Cows. Path Analysis. J. Dairy Sci, (64), 282.
Rev. prod. anim., 21 (2): , 2009 161
Modelo estructural para mejorar la organización y el control de la reproducción…
JÖRESKOG, K. y D. SÖRBOM. (1999). LISREL 8.30. User's Reference Guide Lincolnwood, IL Scientific Software International.
ERB, H. N., SMITH, R. D., OLTENACU, P. A., GUARD, C. L., HILLMAN, R. B., POWERS, P. A., et al. (1985). Path Model of Reproductive Diseases and Performance, Milk Fever, Mastitis, Milk Yield and Culling in Holstein Cows. J. Dairy Sci, 68 (12), 3337-3349.
LOYOLA, C. J., BERTOT, J. A. Y VAZQUEZ, R. (2005). Evaluación de la calidad de la detección del celo en rebaños bovinos lecheros en condiciones de Camagüey. Memorias del evento Las Ciencias Técnicas y Agropecuarias por un Desarrollo Sostenible, Universidad de Camagüey, Camagüey, Cuba.
GALINA, C. S., RUBIO, I., BASURTO, H. Y ORIHUELA, A. (2001). Consequences of Different Suckling Systems for Reproductive Activity and Productivity of Cattle in Tropical Conditions. Applied Anim Behaviour Sci, (72), 255-262.
MENENDEZ, A. (2003). Un enfoque global sobre el comportamiento reproductivo del ganado vacuno. Revista ACPA, (1), 41-46. G AY, J. M. (2006). Determining Cause and Effect in Herds. Vet. Clin. Food Anim, (22), 125-147. MONTIEL, F. y AHUJA, C. (2005). Body Condition and Suckling as Factors Influencing the Duration of Postpartum Anestrus in Cattle: a Review. Anim Reprod. Sci, (85), 1-26. GRÖHN, Y. T. EICKER, S. W.; DUCROCQ, V. y HERTL, J.A. (1998). Effect of Diseases on the Culling of Holstein Dairy Cows in New York State. J. Dairy Sci, 81 (4), 966-978. NATION D. y MCMILLAN, J. (2001) The Phantom Cow Síndrome.A study of cows that are not observed in oestrus within 24 days of an unsuccessful mating. Final Report, The University of Melbourne, Dairy Herd Improvement Fund and NHIA. HAIR, J. F. A., R. E.; TATHAM, R. L. y BLACK, W. C. (1999). Multivariant Data Analysis (Fourth Edition Inc ed. Vol. Chapter 11), Prentice-Hall. HEUER C., SCHUKKEN Y. H. Y DOBBELAAR P (1999). Postpartum Body Condition Score and Results from the First Test Day Milk as Predictors of Disease, Fertility, Yield, and Culling in Commercial Dairy Herds. J. Dairy Sci, 82 (2), 295-304. VAZQUEZ, R., CONDE, G. y DE LOS REYES, A. (1985). Estudio del comportamiento reproductivo de las novillas F1 (HxC) en condiciones de producción comercial en la provincia de Camagüey. Rev. Prod. Anim, 2 (1), 71-80.
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