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Abstracts - Genetics and reproduction

Production of genetically modified porcine embryos via lipofection of zona-pellucida-intact oocytes using the CRISPR/Cas9 system

It is possible to produce knock-out embryos via lipofection of zona-pellucida-intact porcine oocytes with similar efficiencies as with electroporation.

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Dam parity structure and body condition during lactation influence piglet growth and gilt sexual maturation through pre-finishing

Although progeny body weights were typically less from first parity dams through 45 days of age, these progeny were similar or heavier at 100 and 145 days of age in contrast to progeny from other parities.

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Effects of maternal factors and environment on early colonization of intestinal microbiota in piglets

These results indicate that microbiota in feces, colostrum, and vaginal secretions of sows more easily colonized piglet intestines through a symbiotic effect.

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Effect of sow body weight at first service on body status and performance

Achieving optimal body weight at first service is essential for maximizing the sow’s lifetime performance.

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Short-term fixation of sows in farrowing pens using different opening procedures

For short-term fixation of five days around farrowing on commercial farms, the farrowing crate should be opened in the evening.

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Physiology and nutrition of late gestating and transition sows

The physiological processes and how they change dynamically as the sow approaches farrowing greatly affect sow productivity.

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Abstract

Characteristics of thermal images of the mammary gland and of performance in sows differing in health status and parity

Thermography coupled with Artificial Intelligence systems can help identify and orient the diagnosis of symptomatic animals to prompt adequate reaction at the earliest time.

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New vaginal drug delivery system to control time of farrowing and allow supervision of piglet delivery

Findings confirm the efficacy of the novel vaginal drug delivery system for induction of farrowing in sows.

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Does nursing behaviour of sows in loose-housing differ from that of sows in farrowing crates?

Shorter nursing duration and more nursing terminations by the sow were observed in loose housing than in farrowing crates.

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Comparing gut microbiota and metabolic status of sows with different litter sizes during gestation

Microbial abundances and community structures differed significantly between sows with different litter sizes and gestation stages.

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Polyamines protect boar sperm from oxidative stress in vitro

Spermine and spermidine alleviate oxidative stress via the antioxidant capacity, thereby improving the efficacy of boar semen preservation.

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Intrauterine immunizations trigger antigen-specific mucosal and systemic immunity in pigs and passive protection in suckling piglets

The study assessed whether vaccines administered to the uterus at breeding can lead to sufficient colostral antibodies to protect suckling piglets against PEDV.

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Definition for the most commonly used pig terms

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Abstract

Impact of birth weight and daily weight gain during suckling on the weight gain of weaning piglets

Piglets with 1.25 to 2.30kg BW and low weight gain during suckling presented a partial compensatory growth during the nursery phase.

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Effect of the boar on swine inflammation and necrosis syndrome in offspring

The effects of different boars from the Duroc and Pietrain breeds on the prevalence of swine inflammation and necrosis syndrome in their offspring.

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Suitability of semen stress tests for predicting fertilizing capacity of boar ejaculates

Cold- and heat-resistance were dependent factors and sperm motility but neither semen stress test can be used as a sole test for predicting the fertilizing capacity of boar ejaculates.

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Administration of cloprostenol to sows improves WSI and farrowing rate

The application of cloprostenol after farrowing improved fertility rates and reduced non-productive days.

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Vaginal microbiota differences associated with pelvic organ prolapse risk during late gestation in commercial sows

Sows with greater pelvic organ prolapse risk have unique vaginal microflora.

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Investigating pig survival in different production phases using genomic models

Survival is a complex trait with low heritability; however, important genetic gains can still be obtained, especially under a genomic prediction framework.