Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 6 of 6 for “"lactation curves"”.
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Lactation curves in dairy goats
"Lactation curves were modeled using a multiphasic function and effects of breed, parity, season of kidding, and level of milk production on the curve were studied. Milk production data on dairy goats were grouped into 90 subclasses: breed (5) by parity (3) by season (2) by level of production (3). …
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A Biometrical and Genetic Study of Tribolium Egg Production Curves as A Model for Lactation Curves
… equation that describes the nonlinear lactation curve of dairy cattle. The most common method to obtain parameter estimates for these mathematical equations has been to transform the nonlinear function to its linear counterpart and then find parameter estimates for the transformed …
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Milk fatty acid profiles of Holstein and crossbreds of Holstein, Jersey, Normande, Montbéliarde, and Viking Red Dairy breeds in confinement and pasture-based herds
… days in milk, de novo and mixed FA peaked in mid-lactation, while preformed FA were higher in early lactation. Multiparous crossbred cows had higher proportions of de novo FA and lower mixed FA and tended to have lower C16:0 FA than Holstein cows. Over 305-d, the crossbred cows produced similar …
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MAPPING GENOMIC VARIANTS ASSOCIATED WITH FUNCTIONAL AND HEALTH TRAITS IN DAIRY CATTLE POPULATION
… data and statistical models to estimate expected lactation curves and calculate resilience indicators. Four indicators were evaluated: variance of milk yield deviations (LnVar), autocorrelation of residuals (rauto), frequency of perturbations (wfPert), and total milk loss (dPert). Analysis of …
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Mælidagalíkan fyrir íslenska kúastofninn
… evaluation of dairy cows but in Iceland a lactation model is still used. The objective of this study was to investigate the genetics of lactation curves of Icelandic dairy cows and the possible benefits of implementing an RR model for genetic evaluation in the population. 480,495 test day …
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Nutritional and genetic characterization of dairy cows managed on pasture-based systems, identifying key aspects to improve their performance
… breeds evaluated, translated into different lactation curves and milk solids synthesis patters. To achieve the fourth objective, a dataset considering 1,429,132 records from 586,624 cows that calved between 1998 and 2018 was compiled. Pedigree information, milk, milk protein, and milk fat, as …