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https://hdl.handle.net/1959.11/13526
Title: | Improving Pre-weaning Survival of Piglets Through Genetic Selection and Management | Contributor(s): | Tabuaciri, Poasa (author); Bunter, Kim (supervisor); Graser, Hans (supervisor) | Conferred Date: | 2013 | Copyright Date: | 2012 | Open Access: | Yes | Handle Link: | https://hdl.handle.net/1959.11/13526 | Abstract: | A total of 1009 primi- and multiparous sows from two maternal (Large White and Landrace) and two terminal (Duroc and Large White) lines were recorded between early spring (N=494 sows) of 2009 and late summer (N=515 sows) of 2010. Approximately 84% of these sows farrowed within the experimental periods, producing 9133 piglets from 847 litters (610 sows). Both sow and piglet traits were recorded to investigate their associations with piglet survival until weaning, which was estimated from an inventory of individual piglet's deaths. Using logistic regression, in addition to season, line, and parity effects, both sow and piglet attributes were identified that had significant phenotypic associations with individual piglet survival until weaning. It was important to consider the sow and piglet attributes simultaneously to identify factors associated with piglet survival. Important sow factors included health pre-farrowing, interval between transfer and farrowing dates, and teat access. Piglet factors included birth weight, rectal temperature, body condition, ponderal index, skin colour, respiration, muscle tone, shivering, hydration level, fostering status, and gender. The genetic basis of the traits recorded was examined to identify which traits were heritable and potential selection criteria. Estimates of genetic correlations between traits can then be used to identify consequences of selection. | Publication Type: | Thesis Doctoral | Fields of Research (FoR) 2008: | 070201 Animal Breeding | Fields of Research (FoR) 2020: | 300305 Animal reproduction and breeding | Socio-Economic Objective (SEO) 2008: | 830308 Pigs | Socio-Economic Objective (SEO) 2020: | 100410 Pigs | Rights Statement: | Copyright 2012 - Poasa Tabuaciri | HERDC Category Description: | T2 Thesis - Doctorate by Research |
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Appears in Collections: | Thesis Doctoral |
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open/MARCXML.xml | MARCXML.xml | 2.92 kB | Unknown | View/Open |
open/SOURCE03.pdf | Abstract | 394.59 kB | Adobe PDF Download Adobe | View/Open |
open/SOURCE04.pdf | Thesis | 4.85 MB | Adobe PDF Download Adobe | View/Open |
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