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Abstracts - Genetics and reproduction

Breeding for resilience in finishing pigs can decrease tail biting, lameness and mortality

Breeding for resilience traits based on deviations in longitudinal weight data can decrease pigs’ tail biting wounds, lameness and mortality while improving uniformity at the pen level.

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Automated oestrous detection in sows using a robotic imaging system

Combining vulva volume features with days from weaning could be a suitable method to detect the onset of oestrous in sows.

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Fertility after photodynamic inactivation of bacteria in extended boar semen

Photodynamic inactivation could be a promising contribution to the One Health concept with the potential to reduce antimicrobial resistance in animal husbandry.

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Split weaning improves pregnancy rate and embryo survival in sows mated in lactation

Weaning a portion of the litter prior to mating in lactation improved pregnancy rates and embryo survival.

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Evaluation of different thawing protocols on Iberian boar sperm preserved for 10 years at different liquid nitrogen levels

Thawing at 70 °C for 8 seconds maximizes post-thaw sperm quality, especially in those samples stored constantly submerged in liquid nitrogen.

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Impact of the leptin receptor gene on pig performance and quality traits

With current low-protein diets, the T allele is expected to be cost-effective only in niche markets where a very high level of marbling is critical.

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Hourly feeding of lactating sows: Enhancing performance and welfare in smart farm-based systems

An hourly feeding regime could optimize sow productive performance, body condition, milk yield, welfare, and piglet growth in swine production.

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Gut microbiota affects the estrus return of sows by regulating the metabolism of sex steroid hormones

Changes in gut microbial composition significantly altered the functional capacity of steroid hormone biosynthesis in the gut microbiome.

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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.