Abstracts - Genetics and reproduction

More than 85% of primiparous sows can be successfully post-cervical inseminated with doses containing 1.5 × 109 sperm cells in the absence of the boar during insemination without impairing the reproductive performance.

In conclusion, premature births increase the number of intra-partum deaths and result in lower birthweights, the presence of apnoea, and severe metabolic alterations in piglets.

This study evaluated the effect of full physical boar exposure at different stages of lactation on the incidence of lactation oestrus in both primiparous and multiparous sows.

In conclusion, a greater PRL/P4 ratio 24 h prepartum, characterized by lower P4 concentrations and a trend for greater PRL concentrations peripartum, led to increased colostrum yield in primiparous sows.

Our results suggest that at least at the chosen stocking densities, parity and space allocation have minimal effect on a number of commonly-used welfare measures.

On the basis of the presented results, it should be noted that the use of oxytocin into insemination doses improves the farrowing rate and other parameters of the reproductive performance of sows.

High PBA in parity 1 can be used to predict that a sow will have high reproductive performance and lifetime performance.

These results indicate that AI using 2.0 × 109 FTS can result in acceptable pregnancy rates and litter sizes but with no measurable benefit for addition of prostaglandin.

The aim of this study was to evaluate the effect of including different percentages of Duroc breed in maternal line and gender on meat quality and intramuscular and subcutaneous fatty acid composition.

Organoleptic ham criteria for immunocastrated males hams were equivalent to those found for surgically castrated males and gilts hams, demonstrating the efficacy of vaccination in these study conditions.

The main objective of this thesis was to develop a protocol to efficiently apply flow cytometric sex-sorting procedure on boar spermatozoa.

These results suggest that some salivary metabolites could be biomarkers of the pre‐pubertal stage in gilts.

These results suggest that it is possible to manipulate dietary insulin response in cyclic gilts and, thus, improve reproductive efficiency when feeding starch as the main energy source during the late luteal and follicular phases of the cycle.

The objective of this study was to compare the rhinitis lesions scored on the snouts of pigs according to vaccine status and parity of their mother (primiparous and multiparous; vaccinated or unvaccinated).

Reducing post-mating feed intakes to maintenance levels impaired embryo survival.

Boar contact is an effective method to stimulate oestrus within 26 days of farrowing in both lactating and weaned sows.

The aim of this study was to investigate the effects of different induction protocols when applied on d114 of gestation.

Researchers from Wageningen University explain that a number of important characteristics of European pigs have Asian origins.

Selection for increased UC results in larger ovaries and uterine horns, but TRU was not useful for estimating these traits in gilts of the age studied.

This is the first described relationship between reproductive failure and toxic compounds released from plastic bags.

Data suggest that the oviduct functions as a biological sensor that screens the spermatozoon, and then responds by modifying the oviductal environment.

This study concluded that Laiwu had stronger capacity of immunological stress resistance and next was Lulai among three breeds. Chromium yeast helped piglets relieve immunological stress.

Supplementing freezing media with 2 mm GSH greatly improves boar sperm cryopreservation technology, as it significantly improves the fertilizing ability of frozen-thawed spermatozoa.

Dietary treatments of ≥800 IU/kg feed showed beneficial effects for breeding swine in terms of bone mineral content and ultimate strength, decreased number of still born piglets, and greater vitamin D status in comparison with dietary treatments of 200 IU/kg of feed.