SVIBOR - Project code: 4-05-038

MINISTRY OF SCIENCE AND TECHNOLOGY

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Project code: 4-05-038


HEREDITY AND CHANGING OF RELATIONS AND STRUCTURE OF TISSUES OF PIGS


Main researcher: JURIĆ, IVAN (19332)


Assistants
Type of research: basic
Duration from: 04/30/91. to 04/30/96.
Papers on project (total): 25
Papers on project quoted in Current Contents: 9
Institution name: Agronomski fakultet, Zagreb (178)
Department/Institute: Department of Animal Science
Address: Svetošimunska c.25, 41000 Zagreb, Croatia
Communication
Phone: 385 (01) 2335-777
Fax: 385 (01) 215-300
Summary: The project named: Heridity and changing the relation and composition of tissues in swine, was notified to the Ministry of science, technology and informatics of the Republic of Croatia on December 12, 1990 and accepted by the Ministry on April 30, 1991. Six experiments have been carried through and two are in the course. In two experiments the interrelations and composition of muscular, fatty and bony tissues in swine belonging to the Large White and Swedish Landrace, to the lines of Hypor hybrids and to theirs cross-breeds were subjected to investigation. Totally 512 fattened pigs have beeen dissected, and by the dissection according to Weniger 142 data upon every pig brought together. From total obtained about 72000 data about 35000 ones till now were processed, eighteen papers published and further five are in the press. The obtained data are used to estimate the breeding value of animals, on grounds of which a carefully directed and assortative maiting is practised. The relations of variances, particularly the part of additive variance (VA) in phenotype variance (VP), are investigated. The correlation and regression coefficients concerning to the relations and distribution of tissues in carcass are investigated too. In the framework of project, besides published papers, two doctoral theses have been treated and maintained.

Keywords: pigs, Swedish Landrace, Large White, Hypor, tissues: muscular fatty, bony, heridity, aditive and phenotype variances, regression, correlation

Research goals: The aim of investigation is to contribute to the comprehension of theoretic laws in the domain of population genetics as a basis of proper selecting work in swine. The characteristics of variability for the correlation among muscular, fatty and bony tissues, as well as the relations between parents and descendants according to the postulations of Robinson (1977) are investigated. In terms of the theoretic explanation of heredity the target is set out to investigate the regression relation parents: descendants (h squared = 2 b, b=sum xy divided by sum x squared, where x=parent mated with average parent, y=descendant) as the relations x = value of a parent, x1=value of another parent, y= value of descendant. The natural interpretation of those relations by the evidence of x and x1 requires that the value y would be expressed in space, what means giving up te bidimensional normal distribution.
Other information about the project.
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