master's thesis
Regression analyses in turkey growth description

Goran Kerep (2014)
Sveučilište Josipa Jurja Strossmayera u Osijeku
Poljoprivredni fakultet
Zavod za Specijalnu zootehniku
Metadata
TitleRegresijske analize u opisivanju rasta pura
AuthorGoran Kerep
Mentor(s)Zoran Škrtić (thesis advisor)
Abstract
Istraživanje je provedeno na 30 muških i 30 ženskih pura podrijetlom Nicholas 700. Pure su tovljene tijekom 19 tjedana. U cilju opisivanja rasta pura koristile su se stope rasta, asimetrična S-funkcija, eksponencijalna, razlomljena i jednostavna linearana regresijska analiza. Procjena točke infleksije i odvajanje faze rasta dobivena je pomoću asimetrične S-funkcije (Kralik i Scitovski, 1993). Purani su na kraju tova bili teži od pura za 34,63%. Razlike na kraju, ali i tijekom cijelog trajanja tova bile su statistički značajne (P<0,001). Prema asimetričnoj S-funkciji faza progresivnog rasta kod pura započinje nakon 5. tjedna života, dok kod ženki započinje par dana kasnije. Biološki maksimum kod mužjaka bio je 17,966 kg, dok je kod ženki 12,889 kg. Intenzivni rast kod ženki završava početkom 15. tjedna života, a kod mužjaka nekoliko dana kasnije (na kraju 15.tjedna starosti). Točka infleksije kod purana je sredinom, a kod pura na početku 10. tjedna života. Asimetrična S-funkcija najbolje je prilagođena opisivanju rasta pura od istraženih regresijskih modela.
Keywordsturkeys growth rate asymmetric S – function regression
Parallel title (English)Regression analyses in turkey growth description
Committee MembersZlata Kralik
Dalida Galović
GranterSveučilište Josipa Jurja Strossmayera u Osijeku
Poljoprivredni fakultet
Lower level organizational unitsZavod za Specijalnu zootehniku
PlaceOsijek
StateCroatia
Scientific field, discipline, subdisciplineBIOTECHNICAL SCIENCES
Agronomy
Animal Husbandry
Study programme typeuniversity
Study levelgraduate
Study programmeZootechnique, specialization: The Nutrition of Domestic Animals, Hunting and Beekeeping, Special Zootechnique
Academic title abbreviationmag. ing. agr.
Genremaster's thesis
Language Croatian
Defense date2014-09-30
Parallel abstract (English)
Study was conducted on 30 male and 30 female turkeys, Nicholas 700 provenience. Turkeys were fattened during 19 weeks. Growth rate, asymmetric S – function, exponential function, rational function and simple linear regression analysis were used to describe turkey growth. Inflection point and growth phase separation estimate were obtained by asymmetric S-function (Kralik and Scitovski, 1993). At the end of fattening, male turkeys had more weight than females by 34,63%. Differences in weight between male and female turkeys at the end, as well as during fattening were statistically significant (P<0,001). According to asymmetric S-function, the phase of progressive growth in male turkeys begins after the 5th week of life, and in females it begins a few days later. Biological maximum in male turkeys was 17,966 kg, while in females it was 12,889 kg. Intensive growth in female turkeys ends by the beginning of 15th week of life, while in male turkeys it it ends a few days later (by the end of 15th week of life). Point of inflection in male turkeys occurs at the middle of 10th week of life, while in females it occurs at the beginning of the 10th week of life. Asymmetric S – function is best suited for describing turkey growth within the studied regression models.
Parallel keywords (Croatian)pure prirasti asimetrična S-funkcija regresija
Resource typetext
Access conditionOpen access
Terms of usehttp://rightsstatements.org/vocab/InC/1.0/
Notediplomski rad
URN:NBNhttps://urn.nsk.hr/urn:nbn:hr:151:327446
CommitterLjiljana Vučković Vizentaner