Assessment of oxidative stress biomarker levels during selection and the effects of supplementing dietary 25-hydroxyvitamin D3 on the performance of replacement gilts and primiparous sows under tropical condition

Name: Prester Chuka John Okafor

LCSH: Kasetsart University -- Theses. M.S. (Agricultural Research and Development) 2022

Classification :.LCCS: SF396.9

LCSH: Kasetsart University. Faculty of Agriculture at Kamphaeng Saen -- Theses

LCSH: Swine -- Breeding

LCSH: Swine -- Feeding and feeds

LCSH: Swine -- Effect of stress on

Abstract: The aim of this research was to develop breeding-eligible gilts as sow replacements. The study sample comprised 180 replacement gilts (50% Landrace x 50% Yorkshire) averaged 10 weeks old and 29.5 ± 1.7 kg body weight at entry. In experiment 1 (Chapter 2), it was hypothesized that selection process may increase the activity of oxidative stress biomarkers in tropical condition. The effects of management practices including movement and handling during gilt selection on the biomarkers: malondialdehyde (MDA), superoxide dismutase (SOD) and catalase (CAT) were examined in two groups of replacement gilts. Activity of SOD and CAT was elevated and differed between groups after selection (P< 0.05). Gilt selection had impact on biomarker levels; however, prolonged exposure to high temperatures reduced feed intake and posed greater risk to mortality, morbidity (P< 0.05). Experiment 2 (Chapter 3) was anchored on the hypothesis that replacement gilts fed with the metabolite, 25(OH)D3 may have more improved reproductive performance than those fed regular VD3. Gilts were fed VD3 (T1) and either of two commercial forms of 25(OH)D3 (T2 and T3), with different epimeric conformations; all treatments were equivalized to 2,000 IU/kg. Structural development, bone conformation, plasma 25(OH)D3, serum ALP activity, reproductive performance and removal causes were examined. Infantile vulva (P = 0.010), inverted (P = 0.048) and prominent (P < 0.001) teats differed between treatments. Gilts on T2 diet had better reproductive organ development than T3-fed gilts. There was four-fold increase in the concentration of 25(OH)D3 during lactation (P < 0.001). This could be explained by an increase in feed intake and high Ca produced during lactation. The activity of ALP was lower in mature gilts but also increased during lactation (P < 0.001). Sows fed 25(OH)D3 had a low number of stillbirth (P = 0.049). Sickness, death, slow growth, leg and reproductive problems were the major causes of gilt removal. While T2 conferred more benefit to developing gilts than T1 and T3, it can be concluded that epimeric conformation may be an important source of variation in the biological functions of 25(OH)D3 in replacement gilts and primiparous sows.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Nitipong Homwong

Role: Thesis Advisor

Created: 2022

Modified: 2025-06-24

Issued: 2025-06-24

วิทยานิพนธ์/Thesis

application/pdf

URL: http://www.lib.ku.ac.th/KUthesis/2565/prester-chuk-all.pdf

CallNumber: SF396.9.P74

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Agricultural Research and Development

Grantor: Kasetsart University

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