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Abstracts - Genetics and reproduction

Low-density lipoproteins, resveratrol and quercetin as alternative additives to improve boar semen cooling

Low-density lipoproteins can improve the motility and kinetics of boar semen during cooling while it could modulate the sperm's mitochondrial activity.

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Factors associated with farrowing assistance in hyperprolific sows

The frequency of farrowing assistance in sows varied among herds and was influenced by parity number.

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Genetic and phenotypic time trends of litter size, piglet mortality, and birth weight in pigs

The increases in litter size and piglet survival rates due to balanced breeding policies lead to reduced total numbers of dead piglets coinciding with a certain pig production volume.

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Effect of postpartum meloxicam administration to sows and split-suckling

Postpartum administration of meloxicam to sows reduced clinical cases of disease, increased ADG in pigs, and increased carcass weight at slaughter.

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Myo-inositol improves the viability of boar sperm during liquid storage

The addition of myo-inositol to semen extender improved the boar semen quality by decreasing the effects of oxidative stress during liquid preservation.

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Heat stress alters hematological parameters in barrows and gilts

Biological sex mediates, at least in part, the physiological response to heat stress.

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Heat stress alters the ovarian proteome in prepubertal gilts

Heat stress alters the ovarian proteome and multiple biological pathways and systems in prepubertal gilts; changes that potentially contribute to female infertility.

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Fertility responses of melatonin-treated gilts when there are different temperatures and lighting conditions

Melatonin treatment had positive effects on estrous duration and embryo survival, especially in the summer.

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Vaginal and vestibular electrical resistance as an alternative marker for optimum timing of artificial insemination

Change in electrical resistance in the vagina has the potential to accurately predict ovulation timing, but more work is required.

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Long-acting injectable progesterone treatment prior to puberty induction in gilts

Injectable progesterone treatment did not benefit the reproductive performance of prepubertal and peripubertal gilts.

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Analysis of artificial insemination center management factors that contribute to sperm parameters and boar longevity

The results reveal better sperm quality for untreated boars than for PGF2α-treated boars, which might indicate that the underlying fertility of boars necessitating treatment is inferior compared to boars that can be collected without further treatment.

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Differences of semen microbiota among breeding boars with different reproductive ages

The semen of older boars contained a higher abundance of harmful bacteria, which contributes to the observed reduction in semen anti-oxidant capacity and overall semen quality in this group.

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333 Emerging voices - Individual and nutritional factors affecting the homogeneity and performance of Iberian pig production

An investigation at both phenotypic and genotypic levels of the implications of the intrauterine development of the piglets in the postnatal growth. Doctoral thesis from the Faculty of Veterinary Medicine, UCM, Spain, advised by Antonio Gonzalez de Bulnes, Cristina Óvilo Martín and Beatriz Isabel Redondo.

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The impact of functional teat number on reproductive throughput in swine

Results suggest increasing functional teat number would enhance both piglet survival and reproductive throughput.

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Genetic associations between human-directed behavior and intraspecific social aggression in growing pigs

Heritability estimates for all studied traits suggest they could be suitable as a method of phenotyping aggression and fear/boldness for genetic selection purposes.

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Reproductive performance of gilts and weaned sows grouped at different days after insemination

Group housing gestating sows 2 days after breeding compromised litter size; however, mixing gilts on days 1 to 4 after breeding did not impair reproductive performance.

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Lameness in pregnant sows alters placental stress response

Lameness may decrease sow gestation length and reduce placental efficiency in protecting the offspring from the sows’ stress response.

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Genetic analysis of protein efficiency and its association with performance and meat quality traits under a protein-restricted diet

Protein efficiency is a heritable trait that can be considered in breeding programs to reduce the environmental impact of pig production.

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Analysis of image-based sow activity patterns reveals associations with piglet survival and early growth

The live-born piglets of sows that were more active the day before farrowing, standing and in other activity than drinking and eating, had higher survival rates.

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Update on the methods for semen quality evaluation in swine from farm to the lab

This work aims to summarise the methods utilised in farms and research laboratories to evaluate sperm quality in pigs.

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Genetic parameters for early piglet weight, litter traits and number of functional teats in organic pigs

There is genetic variation in individual piglet weight, litter traits, and number of functional teats in organically and outdoor-reared pigs.

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Detecting sow vulva size change around estrus using machine vision technology

The LiDAR camera has the potential as a non-invasive tool to help identify the sow's estrus.

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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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