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TY - JOUR AU - Peters, S. O. AU - Ikeobi, C. O. N. AU - Ozoje, M. O. AU - Adebambo , O. A. PY - 2021/01/01 Y2 - 2026/08/10 TI - Modelling growth in seven chicken genotypes JF - Nigerian Journal of Animal Production JA - NJAP VL - 32 IS - 1 SE - Articles DO - 10.51791/njap.v32i1.1079 UR - https://mail.njap.org.ng/index.php/njap/article/view/1079 SP - 28-38 AB - <p><em><span style="font-weight: 400;">Three no</span></em><em><span style="font-weight: 400;">n</span></em><em><span style="font-weight: 400;">-</span></em><em><span style="font-weight: 400;">li</span></em><em><span style="font-weight: 400;">near </span></em><em><span style="font-weight: 400;">growth </span></em><em><span style="font-weight: 400;">models were used to fit weight</span></em><em><span style="font-weight: 400;">-</span></em><em><span style="font-weight: 400;">age </span></em><em><span style="font-weight: 400;">data </span></em><em><span style="font-weight: 400;">for </span></em><em><span style="font-weight: 400;">seven </span></em><em><span style="font-weight: 400;">chicken </span></em><em><span style="font-weight: 400;">genotypes: </span></em><em><span style="font-weight: 400;">Comparisons </span></em><span style="font-weight: 400;">w</span><em><span style="font-weight: 400;">ere </span></em><em><span style="font-weight: 400;">made among </span></em><em><span style="font-weight: 400;">these models </span></em><em><span style="font-weight: 400;">for goodness of fit</span></em><em><span style="font-weight: 400;">, </span></em><em><span style="font-weight: 400;">biological interpretability </span></em><em><span style="font-weight: 400;">and </span></em><em><span style="font-weight: 400;">computational case. Monomolecular </span></em><em><span style="font-weight: 400;">and </span></em><em><span style="font-weight: 400;">Richards </span></em><em><span style="font-weight: 400;">Models </span></em><em><span style="font-weight: 400;">overestimated body </span></em><em><span style="font-weight: 400;">weight </span></em><em><span style="font-weight: 400;">at </span></em><em><span style="font-weight: 400;">the </span></em><em><span style="font-weight: 400;">early </span></em><em><span style="font-weight: 400;">phases </span></em><em><span style="font-weight: 400;">of </span></em><em><span style="font-weight: 400;">growth</span></em><em><span style="font-weight: 400;">. </span></em><em><span style="font-weight: 400;">A</span></em><em><span style="font-weight: 400;">ll </span></em><em><span style="font-weight: 400;">the </span></em><em><span style="font-weight: 400;">three </span></em><em><span style="font-weight: 400;">models underestimated the asymptotic </span></em><em><span style="font-weight: 400;">mature </span></em><em><span style="font-weight: 400;">weight </span></em><em><span style="font-weight: 400;">but </span></em><em><span style="font-weight: 400;">Gumpertz </span></em><em><span style="font-weight: 400;">funct</span></em><em><span style="font-weight: 400;">ion </span></em><em><span style="font-weight: 400;">ga</span></em><span style="font-weight: 400;">v</span><em><span style="font-weight: 400;">e a better </span></em><em><span style="font-weight: 400;">estimate </span></em><em><span style="font-weight: 400;">than the </span></em><em><span style="font-weight: 400;">other </span></em><em><span style="font-weight: 400;">two</span></em><em><span style="font-weight: 400;">. </span></em><em><span style="font-weight: 400;">Maturing rate</span></em><span style="font-weight: 400;">s </span><em><span style="font-weight: 400;">were also variable and Richards </span></em><em><span style="font-weight: 400;">Model </span></em><em><span style="font-weight: 400;">gave the </span></em><em><span style="font-weight: 400;">best estimate of </span></em><em><span style="font-weight: 400;">K</span></em><em><span style="font-weight: 400;">. </span></em><em><span style="font-weight: 400;">Using </span></em><em><span style="font-weight: 400;">the</span></em><em><span style="font-weight: 400;">se </span></em><em><span style="font-weight: 400;">three </span></em><em><span style="font-weight: 400;">non</span></em><em><span style="font-weight: 400;">-</span></em><em><span style="font-weight: 400;">li</span></em><em><span style="font-weight: 400;">near models to </span></em><em><span style="font-weight: 400;">describe </span></em><em><span style="font-weight: 400;">growth </span></em><em><span style="font-weight: 400;">rate </span></em><em><span style="font-weight: 400;">of </span></em><em><span style="font-weight: 400;">chest girth of </span></em><em><span style="font-weight: 400;">the </span></em><em><span style="font-weight: 400;">seven </span></em><em><span style="font-weight: 400;">chicken geno</span></em><span style="font-weight: 400;">t</span><em><span style="font-weight: 400;">ypes yields a different </span></em><em><span style="font-weight: 400;">result </span></em><em><span style="font-weight: 400;">from that of </span></em><em><span style="font-weight: 400;">the </span></em><em><span style="font-weight: 400;">bod</span></em><span style="font-weight: 400;">y w</span><em><span style="font-weight: 400;">eight</span></em><em><span style="font-weight: 400;">. </span></em><em><span style="font-weight: 400;">T</span></em><em><span style="font-weight: 400;">he p</span></em><em><span style="font-weight: 400;">oint </span></em><em><span style="font-weight: 400;">of </span></em><em><span style="font-weight: 400;">inflection </span></em><em><span style="font-weight: 400;">ranged </span></em><em><span style="font-weight: 400;">from </span></em><em><span style="font-weight: 400;">- </span></em><span style="font-weight: 400;">3 5</span><em><span style="font-weight: 400;">6 </span></em><em><span style="font-weight: 400;">for </span></em><em><span style="font-weight: 400;">FINA </span></em><em><span style="font-weight: 400;">(</span></em><em><span style="font-weight: 400;">F</span></em><em><span style="font-weight: 400;">/Na</span></em><em><span style="font-weight: 400;">) </span></em><em><span style="font-weight: 400;">ge</span></em><em><span style="font-weight: 400;">not</span></em><em><span style="font-weight: 400;">ype </span></em><em><span style="font-weight: 400;">to </span></em><span style="font-weight: 400;">2</span><em><span style="font-weight: 400;">8</span></em><em><span style="font-weight: 400;">.</span></em><em><span style="font-weight: 400;">26 </span></em><em><span style="font-weight: 400;">for </span></em><em><span style="font-weight: 400;">frizzled </span></em><em><span style="font-weight: 400;">(Frx </span></em><em><span style="font-weight: 400;">Fr</span></em><em><span style="font-weight: 400;">) </span></em><em><span style="font-weight: 400;">genotype</span></em><em><span style="font-weight: 400;">. </span></em><em><span style="font-weight: 400;">Genetic variations </span></em><em><span style="font-weight: 400;">in </span></em><em><span style="font-weight: 400;">rates </span></em><em><span style="font-weight: 400;">of gain</span></em><em><span style="font-weight: 400;">, </span></em><em><span style="font-weight: 400;">maluring rute </span></em><em><span style="font-weight: 400;">und </span></em><em><span style="font-weight: 400;">mature </span></em><em><span style="font-weight: 400;">size </span></em><span style="font-weight: 400;">w</span><em><span style="font-weight: 400;">ere </span></em><em><span style="font-weight: 400;">observed</span></em><em><span style="font-weight: 400;">. </span></em></p> ER -