Statistical modelling of growth curve for longitudinal data on a feeding trial in goat breeds
The growth curve parameters were estimated extending a linear regression to higher degree polynomial with attempts to use also the biologically appealing Gombertz function. The data contained monthly weight records from weaning to the age of 14 months of kids in two Omani goat breeds Sahrawi and J...
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| Format: | Article |
| Language: | English |
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Scientific Agricultural Society of Finland
2024-10-01
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| Series: | Agricultural and Food Science |
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| Online Access: | https://journal.fi/afs/article/view/145198 |
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| author | Ihab Mostafa Shaat Alaa Alhamadani Khafan Al-Shargi Rashid Al-Habsi Talal Al-Sedeiri Asila Al Naabi Asko Maki-Tanila |
| author_facet | Ihab Mostafa Shaat Alaa Alhamadani Khafan Al-Shargi Rashid Al-Habsi Talal Al-Sedeiri Asila Al Naabi Asko Maki-Tanila |
| author_sort | Ihab Mostafa Shaat |
| collection | DOAJ |
| description |
The growth curve parameters were estimated extending a linear regression to higher degree polynomial with
attempts to use also the biologically appealing Gombertz function. The data contained monthly weight records from weaning to the age of 14 months of kids in two Omani goat breeds Sahrawi and Jabbali used in a feeding trial assessing the effect of concentrate supplement (14% crude protein). The growth curve parameters were estimated within the fixed effects breed and feed concentrate level (2 or 3% of live body weight) with an extension to mixed models using animals as random effects. The parameters and model contrasting were performed with ML or REML as appropriate with relative comparison relying on AIC and significance testing of estimated parameters. The mixed model analyses were performed with publicly available R software package programs. The fixed effect cubic regression with linear random effect model fitted into the data. The higher level of concentrates improved the immediate post-weaning growth in the same way in the breeds while the subsequent growth curve differed with more pronounced weight increments in the Jabbali breed.
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| format | Article |
| id | doaj-art-18ffff58f65f4181b2174ac2de3eb206 |
| institution | OA Journals |
| issn | 1459-6067 1795-1895 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | Scientific Agricultural Society of Finland |
| record_format | Article |
| series | Agricultural and Food Science |
| spelling | doaj-art-18ffff58f65f4181b2174ac2de3eb2062025-08-20T02:10:53ZengScientific Agricultural Society of FinlandAgricultural and Food Science1459-60671795-18952024-10-0133310.23986/afsci.145198Statistical modelling of growth curve for longitudinal data on a feeding trial in goat breeds Ihab Mostafa Shaat0Alaa Alhamadani 1Khafan Al-Shargi2Rashid Al-Habsi 3Talal Al-Sedeiri 4Asila Al Naabi5Asko Maki-Tanila6Livestock Research Center, Directorate General for Agricultural and Livestock Research, Ministry of Agriculture, Fisheries and Water Resources, Oman ; Mawarid, Ministry of Higher Education, Research & Innovation, OmanLivestock Research Center, Directorate General for Agricultural and Livestock Research, Ministry of Agriculture, Fisheries and Water Resources, Oman Livestock Research Center, Directorate General for Agricultural and Livestock Research, Ministry of Agriculture, Fisheries and Water Resources, Oman Livestock Research Center, Directorate General for Agricultural and Livestock Research, Ministry of Agriculture, Fisheries and Water Resources, Oman Livestock Research Center, Directorate General for Agricultural and Livestock Research, Ministry of Agriculture, Fisheries and Water Resources, Oman Mawarid, Ministry of Higher Education, Research & Innovation, Oman Department of Agricultural Sciences, University of Helsinki, Finland The growth curve parameters were estimated extending a linear regression to higher degree polynomial with attempts to use also the biologically appealing Gombertz function. The data contained monthly weight records from weaning to the age of 14 months of kids in two Omani goat breeds Sahrawi and Jabbali used in a feeding trial assessing the effect of concentrate supplement (14% crude protein). The growth curve parameters were estimated within the fixed effects breed and feed concentrate level (2 or 3% of live body weight) with an extension to mixed models using animals as random effects. The parameters and model contrasting were performed with ML or REML as appropriate with relative comparison relying on AIC and significance testing of estimated parameters. The mixed model analyses were performed with publicly available R software package programs. The fixed effect cubic regression with linear random effect model fitted into the data. The higher level of concentrates improved the immediate post-weaning growth in the same way in the breeds while the subsequent growth curve differed with more pronounced weight increments in the Jabbali breed. https://journal.fi/afs/article/view/145198growth rate, concentrate feeding, polynomial regression, mixed model, Omani goats |
| spellingShingle | Ihab Mostafa Shaat Alaa Alhamadani Khafan Al-Shargi Rashid Al-Habsi Talal Al-Sedeiri Asila Al Naabi Asko Maki-Tanila Statistical modelling of growth curve for longitudinal data on a feeding trial in goat breeds Agricultural and Food Science growth rate, concentrate feeding, polynomial regression, mixed model, Omani goats |
| title | Statistical modelling of growth curve for longitudinal data on a feeding trial in goat breeds |
| title_full | Statistical modelling of growth curve for longitudinal data on a feeding trial in goat breeds |
| title_fullStr | Statistical modelling of growth curve for longitudinal data on a feeding trial in goat breeds |
| title_full_unstemmed | Statistical modelling of growth curve for longitudinal data on a feeding trial in goat breeds |
| title_short | Statistical modelling of growth curve for longitudinal data on a feeding trial in goat breeds |
| title_sort | statistical modelling of growth curve for longitudinal data on a feeding trial in goat breeds |
| topic | growth rate, concentrate feeding, polynomial regression, mixed model, Omani goats |
| url | https://journal.fi/afs/article/view/145198 |
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