Correlations between fattening and slaughter performance test results of gilts and their subsequent reproductive performance

Ptak, J.; Mucha, A.; Różycki, M.

doi:10.22358/jafs/65703/2014

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…The results of our own study correspond with the results of the analysis presented by Ptak [2013] for sows of the maternal Polish Landrace (PL) breed. In the latter study sows of the PL breed from herds, where the average backfat thickness of the assessed gilts was less than 10.4 mm, gave birth to and reared more piglets in four consecutive litters, while sows from herds with the average value of this trait exceeding 11.58 mm gave smaller litters (P≤0.01).…”

Section: Sow Backfat Thickness and Production Results And Longevitysupporting

confidence: 87%

The effect of backfat thickness determinedin vivoin breeding gilts on their reproductive performance and longevity

Więcek,

Warda,

Blicharski

et al. 2023

Animal Science Papers and Reports

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The aim of this study was to determine the effects of backfat thickness (mean standardised measurement from in vivo assessment) of Polish Large White (PLW) gilts on their reproductive performance and productive lifespan. The study included 5,122 PLW gilts from 160 breeding herds in Poland, which reproductive performance was analysed on the basis of the rearing results of 20,662 litters. The gilts were divided into two groups differing in mean standardised backfat thickness (P2+P4/2) on the performance test day: I≤10 mm, II>10 mm. Sows in group I vs II had a three month shorter herd life (P≤0.001), gave birth to fewer litters and piglets (P≤0.001), but the average number of piglets born alive and reared to 21 days of age/litter was higher in them (P≤0.001). The number of live-born piglets per 100 days of reproductive life in group I was greater than in group II (P≤0.001). When culling sows in cycles 1–8 and later, there was more intensive culling in group I vs II from cycle 1 to 6 and a lower percentage of sows remaining in the herd. In group I vs II, the proportion of sows with a lifetime productivity of fewer than 30 piglets was 5.5 percentage points higher and that with a production of more than 100 piglets was 1.9 percentage points lower. Our results indicate that the level of fat reserves determined in vivo in breeding gilts can be a preliminary information about the reproductive potential of sows and their predisposition to longevity.

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Section: Sow Backfat Thickness and Production Results And Longevitysupporting

confidence: 87%

The effect of backfat thickness determinedin vivoin breeding gilts on their reproductive performance and longevity

Więcek,

Warda,

Blicharski

et al. 2023

Animal Science Papers and Reports

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Meatiness of tested gilts in three consecutive years

et al. 2019

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In the present study, the aim was to determine the impact of the following factors: age, farm, and gilt genotype, as well as the regression impact of body weight at the end of the performance test on the following tested properties: age at the end of the test/final age (FA), lifetime daily gain (LDG), the backfat thickness measured in two places (according to the Main Breeding program for Central Serbia), the depth of the long back muscle (BM) and the estimated lean meat content/meatiness (M). The study included two farms of pigs (farm 1 and farm 2), for three consecutive years (year 1, year 2 and year 3). The number of tested heads per year was 974 (year 1), 1311 (year 2) and 757 (year 3). The tested gilts were of Swedish Landrace, Large White and Duroc breeds. The gilts originated from 97 sires, while the number of daughters per sires ranged from 10 to 100. The results show that the Duroc animals were the oldest (245 days), which had the highest values for both measures of backfat thickness, but the lowest values for meatiness. In the third study year, the lowest average values were determined for the properties of the LDG, BM and M. The female animals from the farm 1 showed less growth/gain and had lower values for the estimated meatiness. As a result of the study, it was established that all included factors had a very high statistically significant influence on the variation of the tested properties (P <0.001), only the genotype of gilts showed ahigh statistically significant effect on the BM property (P <0.01).

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Differences in body condition of gilts that are maintained from mating to the end of gestation affect mammary development1

Farmer

Comi

Duarte³

et al. 2016

Journal of Animal Science

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The goal of this project was to determine if different body conditions in late gestation that are due to varying body conditions at mating affect mammary development and mammary gene expression of gilts. Gilts that were fed ad libitum in the growing period were selected based on their backfat depths to form 3 groups at mating, namely, low backfat (LBF; 12-15 mm; = 14), medium backfat (MBF; 17-19 mm; = 15), and high backfat (HBF; 22-26 mm; = 16). During gestation, LBF, MBF, and HBF gilts were fed approximately 1.25, 1.43, and 1.63 times maintenance requirements to maintain their differences in body condition. Feed intake was increased by 1 kg in the last 10 d of gestation. Backfat depths of gilts were ultrasonically measured at mating and on d 30, 50, 70, 100, and 109 of gestation. Blood samples were obtained at mating and on d 109 of gestation to measure concentrations of IGF-1, glucose, insulin, estradiol, urea, free fatty acids, leptin, and adiponectin. Gilts were slaughtered on d 110 of gestation to collect mammary glands for compositional analyses. Mammary extraparenchymal tissue weight was lesser in LBF and MBF gilts than in HBF gilts (1,259.3, 1,402.7, and 1,951.5 ± 70.4 g, respectively; < 0.01). The weight of parenchymal tissue was not affected by treatment ( > 0.10), but its composition was altered. Concentrations of DNA and RNA decreased as backfat depth increased ( < 0.05), whereas percent fat and DM increased ( < 0.05). Circulating concentrations of leptin tended to be lower at mating ( < 0.10) and were lower on d 109 of gestation ( < 0.05) in LBF gilts than in HBF gilts. On d 109 of gestation, concentrations of insulin ( < 0.01) and IGF-1 ( < 0.05) were lower in LBF and MBF gilts than in HBF gilts, whereas those of urea were greater ( < 0.05). The mRNA abundance in parenchymal tissue for all genes studied was not affected by treatments ( > 0.10) with the exception of , which had a greater expression level in LBF gilts than in MFB or HBF gilts ( < 0.05). Percent of Ki-67-positive cells, used to assess mammary cell proliferation rate, was greater in HBF gilts than in LBF gilts ( < 0.05). When differences in body conditions of gilts that were present at mating were maintained throughout gestation, it had an impact on mammary development. Extraparenchymal tissue mass was affected and, more importantly, composition of parenchymal tissue was altered, indicating a beneficial effect of gilts being in the thinner treatment groups at mating.

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Correlations between fattening and slaughter performance test results of gilts and their subsequent reproductive performance

Cited by 3 publications

References 8 publications

The effect of backfat thickness determinedin vivoin breeding gilts on their reproductive performance and longevity

The effect of backfat thickness determinedin vivoin breeding gilts on their reproductive performance and longevity

Meatiness of tested gilts in three consecutive years

Differences in body condition of gilts that are maintained from mating to the end of gestation affect mammary development1

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