Genetic and non-genetic factors influencing piglet stillbirth risk
Abstract
Piglet mortality is a major challenge in organic production and in recent years there has been increasing public concern about the level of animal losses before weaning. The main objective of this study was the analysis of the relative role of genetic and non-genetic risk factors for stillbirth in piglets of the world's widely represented breeds. A total of 2,817 litter records of productive parent sows were collected between 2010 and 2013. The following traits were estimated for each litter: the number of stillborn piglets per litter and the stillbirth rate, defined as the number of stillborn piglets divided by the total number of piglets born per litter. In addition, the proportion of litters with at least one stillborn piglet was determined also. The proportion of litters with at least one stillborn piglet for the study sample was 59.2%, indicating that the majority of sows exhibited the occurrence of at least one stillbirth. The mean number of stillborn piglets ranged from 0 to 15 head, with a mean of 1.40 ± 0.03 head, and the range of stillbirth rates per litter was 0 to 100%, with a mean of 12.91 ± 0.28%. The breed of the boar had a highly statistically significant impact on all piglet loss traits at birth employed in the analyses. The mean piglet losses estimates for the piglets born in the Large White boar litters were all found to be lower than those for the piglets born in the Duroc and Landrace boar litters. The year of farrowing also significantly influenced the observed traits, particularly for the number of stillborn piglets per litter and the stillbirth rate. The highest values were observed for litters born in February-March, while farrowing in May exhibited the lowest piglet losses at birth. Furthermore, the sows with the shortest gestation length (110 days) always had at least one stillborn piglet per litter. A significant increase in piglet mortality at birth was associated with an increase in total litter size, both at the level of individual sows and piglets per litter. The optimal average piglet birth weight value, at which piglet losses at birth were lowest, was 1700 g or more. Conversely, piglets with lower average piglet birth weight values exhibited a higher probability of dying at birth or immediately thereafter. As the variability in live birth weight of newborn piglets increased, there was a notable rise in the frequency of litters with at least one stillborn piglet. The lowest proportion of litters with at least one stillborn piglet values were observed in litters in which all newborn piglets had the same body weight at birth. The potential for research on stillbirth includes the analysis of its impact on the average daily growth rates and survival of piglets until weaning, as well as its effect on the development of performance, meat and carcass traits of fattening pigs.References
Adi, Y. K., Boonprakob, R., Kirkwood, R. N., & Tummaruk, P. (2022). Factors associated with farrowing duration in hyperprolific sows in a free farrowing system under tropical conditions. Animals, 12(21), 2943.
Adi, Y. K., Boonprakob, R., Kirkwood, R. N., & Tummaruk, P. (2024). Factors affecting birth weight and stillbirth in sows housed in a tropical environment. Reproduction in Domestic Animals, 59(1), e14500.
Arango, J., Misztal, I., Tsuruta, S., Culbertson, M., Holl, J. W., & Herring, W. (2006). Genetic study of individual preweaning mortality and birth weight in Large white piglets using threshold-linear models. Livestock Science, 101, 208–218.
Asdell, S. A. (1941). The causes of stillbirth in swine and an attempt to control it. Journal of Agricultural Research, 63, 345–353.
Canario, L., Cantoni, E. L. B. E., Le Bihan, E., Caritez, J. C., Billon, Y., Bidanel, J. P., & Foulley, J. L. (2006). Between-breed variability of stillbirth and its relationship with sow and piglet characteristics. Journal of Animal Science, 84(12), 3185–3196.
Christianson, W. T. (1992). Stillbirths, mummies, abortions, and early embryonic death. Veterinary Clinics of North America: Food Animal Practice, 8(3), 623–639.
Chu, M. X. (2005). Statistical analysis of stillbirths in different genotypes of sows. Asian-Australasian Journal of Animal Sciences, 18(10), 1475–1478.
Chu, T. T., Zaalberg, R. M., Bovbjerg, H., Jensen, J., & Villumsen, T. M. (2022). Genetic variation in piglet mortality in outdoor organic production systems. Animal, 16(5), 100529.
Damgaard, L. H., Rydhmer, L., Løvendahl, P., & Grandinson, K. (2003). Genetic parameters for within-litter variation in piglet birth weight and change in within-litter variation during suckling. Journal of Animal Science, 81(3), 604–610.
Dyck, G. W., & Swierstra, E. E. (1987). Causes of piglet death from birth to weaning. Canadian Journal of Animal Science, 67(2), 543–547.
Edwards, S. A. (2002). Perinatal mortality in the pig: environmental or physiological solutions? Livestock Production Science, 78(1), 3–12.
Friend, D. W., & Cunningham, H. M. (1966). Piglet birthweights and the order of farrowing. Canadian Journal of Comparative Medicine and Veterinary Science, 30(7), 179–182.
Glastonbury, J. R. (1976). A survey of preweaning mortality in the pig. Australian Veterinary Journal, 52(6), 272–276.
Hansen, B. G., Langseth, E., & Berge, C. (2023). Animal welfare and cow-calf contact-farmers’ attitudes, experiences and adoption barriers. Journal of Rural Studies, 97, 34–46.
Imboonta, N., Rydhmer, L., & Tumwasorn, S. (2007). Genetic parameters for reproduction and production traits of Landrace sows in Thailand. Journal of Animal Science, 85(1), 53–59.
Ju, M., Wang, X., Li, X., Zhang, M., Shi, L., Hu, P., Zhang, B., Han, X., Wang, K., Li, X., Zhou, L., & Qiao, R. (2021). Effects of litter size and parity on farrowing duration of Landrace×Yorkshire sows. Animals, 12(1), 94.
Kirkden, R. D., Broom, D. M., & Andersen, I. L. (2013). Invited review: Piglet mortality: Management solutions. Journal of Animal Science, 91(7), 3361–3389.
Knap, P. W., Knol, E. F., Sørensen, A. C., Huisman, A. E., van der Spek, D., Zak, L. J., Chapatte, A. G., & Lewis, C. R. (2023). Genetic and phenotypic time trends of litter size, piglet mortality, and birth weight in pigs. Frontiers in Animal Science, 4, 1218175.
Kobek‐Kjeldager, C., Larsen, M. L. V., & Pedersen, L. J. (2023). Changes in piglet and litter characteristics across parities in two highly prolific sow hybrids in an outdoor organic herd. Animal Science Journal, 94(1), e13840.
Koketsu, Y., Iida, R., & Piñeiro, C. (2021). A 10-year trend in piglet pre-weaning mortality in breeding herds associated with sow herd size and number of piglets born alive. Porcine Health Management, 7(1), 4.
Kramarenko, A. S., & Kramarenko, S. (2021). Faktory, shcho vplyvayutʹ na mertvonarodzhennia porosiat u svynomatok velykoyi biloyi porody [Factors affecting piglets stillbirth in Large White sows]. Theoretical and Applied Veterinary Medicine, 9(1), 40–46 (in Ukrainian).
Kramarenko, A., Luhovyi, S., Karatieieva, O., & Kramarenko, S. (2023). Risk factors associated with stillbirth of piglets in Ukrainian Meat breed sows. Scientific Horizons, 26(10), 19–31.
Le Cozler, Y., Dagorn, J., Guyomarc’h, C., Pichodo, X., Quinio, P. Y., & Pellois, H. (2001). Importance et origine des porcelets morts nés: truies nées en 1994 et 1995 suivies en Gestion Technique des Troupeaux de Truies et observations en stations expérimentales. Journees De la Recherche Porcine en France, 33, 299–306.
Le Cozler, Y., Guyomarc’h, C., Pichodo, X., Quinio, P. Y., & Pellois, H. (2002). Factors associated with stillborn and mummified piglets in high-prolific sows. Animal Research, 51(3), 261–268.
Leenhouwers, J. I., Van Der Lende, T., & Knol, E. F. (1999). Analysis of stillbirth in different lines of pig. Livestock Production Science, 57(3), 243–253.
Leenhouwers, J. I., Wissink, P., Van der Lende, T., Paridaans, H., & Knol, E. F. (2003). Stillbirth in the pig in relation to genetic merit for farrowing survival. Journal of Animal Science, 81(10), 2419–2424.
Lewis, C. R., & Hermesch, S. (2013). Genetic parameters and phenotypic trends in the mean and variability of number of stillborn piglets and changes in their relationships with litter size and gestation length. Animal Production Science, 53(5), 395–402.
Lucia Jr., T., Corrêa, M. N., Deschamps, J. C., Bianchi, I., Donin, M. A., Machado, A. C., Meincke, W., & Matheus, J. E. (2002). Risk factors for stillbirths in two swine farms in the south of Brazil. Preventive Veterinary Medicine, 53(4), 285–292.
Ma, K., Su, B., Li, F., Li, J., Nie, J., Xiong, W., Luo, J., Huang, S., Zhou, T., Liang, X., Li, F., Deng, J., & Tan, C. (2024). Maternal or post-weaning dietary fructo-oligosaccharide supplementation reduces stillbirth rate of sows and diarrhea of weaned piglets. Animal Nutrition, 17, 155–164.
MacDonald, M. A., Holness, D. E., & Moxley, J. E. (1963). Some factors influencing the losses of pigs prior to weaning. Canadian Journal of Comparative Medicine and Veterinary Science, 27(10), 237–240.
McPhee, H. C., & Zeller, J. H. (1934). The stillborn pig. Journal of the American Veterinary Medical Association, 85, 224–231.
Nam, N. H., & Sukon, P. (2020). Risk factors associated with stillbirth in swine farms in Vietnam. World’s Veterinary Journal, 10(1), 74–79.
Nam, N. H., & Sukon, P. (2021). Non-infectious risk factors for intrapartum stillbirth in a swine farm in the North of Vietnam. Veterinary World, 14(7), 1829–1834.
Nevrkla, P., Lujka, J., Kopec, T., Horký, P., Filipčík, R., Hadaš, Z., & Střechová, V. (2021). Combined effect of sow parity and terminal boar on losses of piglets and pre-weaning growth intensity of piglets. Animals, 11(11), 3287.
Ngo, C., Boonprakob, R., & Tummaruk, P. (2024). Factors contributing to stillbirth in young hyper-prolific sows in a tropical free‐farrowing system. Reproduction in Domestic Animals, 59(8), e14693.
Ogawa, S., Konta, A., Kimata, M., Ishii, K., Uemoto, Y., & Satoh, M. (2019). Estimation of genetic parameters for farrowing traits in purebred landrace and large white pigs. Animal Science Journal, 90(1), 23–28.
Pedersen, L. J., Berg, P., Jørgensen, G., & Andersen, I. L. (2011). Neonatal piglet traits of importance for survival in crates and indoor pens. Journal of Animal Science, 89(4), 1207–1218.
Pedersen, M. L. M., Velander, I. H., Nielsen, M. B. F., Lundeheim, N., & Nielsen, B. (2019). Duroc boars have lower progeny mortality and lower fertility than Pietrain boars. Translational Animal Science, 3(2), 885–892.
Peltoniemi, O., Yun, J., Björkman, S., & Han, T. (2021). Coping with large litters: The management of neonatal piglets and sow reproduction. Journal of Animal Science and Technology, 63(1), 1–15.
Perry, J. S. (1956). Observations on reproduction in a pedigree herd of large white pigs. The Journal of Agricultural Science, 47(3), 332–343.
Quiniou, N., Dagorn, J., & Gaudré, D. (2002). Variation of piglets’ birth weight and consequences on subsequent performance. Livestock Production Science, 78(1), 63–70.
Raguvaran, R., Sangeetha, P., Prabakar, G., & Ravindra, V. J. (2017). Stillbirth and mummification in swine – A review. Agricultural Reviews, 38(2), 121–128.
Randall, G. C. B., & Penny, R. H. C. (1970). Stillbirth in the pig: an analysis of the breeding records of five herds. British Veterinary Journal, 126(11), 593–603.
Rangstrup-Christensen, L., Krogh, M. A., Pedersen, L. J., & Sørensen, J. T. (2018). Sow level risk factors for early piglet mortality and crushing in organic outdoor production. Animal, 12(4), 810–818.
Renaudeau, D., Anais, C., & Noblet, J. (2003). Effects of dietary fiber on performance of multiparouslactating sows in a tropical climate. Journal of Animal Science, 81(3), 717–725.
Roongsitthichai, A., & Olanratmanee, E. O. (2021). Fetal mortality associated with backfat thickness at first mating and first farrowing of the primiparous sows raised in a commercial herd in Thailand. Tropical Animal Health and Production, 53, 175.
Rosendo, A., Druet, T., Gogué, J., Canario, L., & Bidanel, J. P. (2007). Correlated responses for litter traits to six generations of selection for ovulation rate or prenatal survival in French large white pigs. Journal of Animal Science, 85(7), 1615–1624.
Rydhmer, L., Lundeheim, N., & Canario, L. (2008). Genetic correlations between gestation length, piglet survival and early growth. Livestock Science, 115(2–3), 287–293.
Schild, S. L., Foldager, L., Bonde, M. K., Andersen, H. L., & Pedersen, L. J. (2019). Does hut climate matter for piglet survival in organic production? Animal, 13(4), 826–834.
Schoos, A., Muro, B. B. D., Carnevale, R. F., Chantziaras, I., Biebaut, E., Janssens, G. P. J., & Maes, D. (2023). Relationship between piglets’ survivability and farrowing kinetics in hyper-prolific sows. Porcine Health Management, 9(1), 37.
Scofield, A. M., & Penny, R. H. C. (1969). An analysis of some factors affecting performance in a large pig herd: Annual production of pigs per sow. British Veterinary Journal, 125(1), 36–45.
Sens Junior, V. L., Rosa, E. R., Fagundes, D. P., Peripolli, V., Ulguim, R. D. R., Siqueira, B. P., da Silva Messias, H., Bortolozzo, F. P., & Bianchi, I. (2023). Risk factors associated with stillbirth in sows. Ciência Rural, 53, e20220080.
Sokal, R. R., & Rohlf, F. J. (1995). Biometry: The principles and practice of statistics in biological research. Third Edition. Freeman and Co, New York.
Sprecher, D. J., Leman, A. D., Dziuk, P. D., Cropper, M., & DeDecker, M. (1974). Causes and control of swine stillbirths. Journal of the American Veterinary Medical Association, 165(8), 698–701.
Suriyasomboon, A., Lundeheim, N., Kunavongkrit, A., & Einarsson, S. (2006). Effect of temperature and humidity on reproductive performance of crossbred sows in Thailand. Theriogenology, 65(3), 606–628.
Tani, S., Iida, R., & Koketsu, Y. (2016). Climatic factors, parity and total number of pigs born associated with occurrences and numbers of stillborn piglets during hot or cold seasons in breeding herds. Veterinary Medicine and Animal Sciences, 4, 3.
Vanderhaeghe, C., Dewulf, J., de Kruif, A., & Maes, D. (2013). Non-infectious factors associated with stillbirth in pigs: A review. Animal Reproduction Science, 139(1–4), 76–88.
Vanderhaeghe, C., Dewulf, J., De Vliegher, S., Papadopoulos, G. A., de Kruif, A., & Maes, D. (2010). Longitudinal field study to assess sow level risk factors associated with stillborn piglets. Animal Reproduction Science, 120(1–4), 78–83.
Vázquez, C., Menaya, C., Benito, J., Ferrera, J. L., & Garcia-Casco, J. M. (1994). The influence of parity and season on the prolificacy and maternal ability of Iberian sows. Pig News and Information, 15(4): 121–124.
Yang, X., Hu, R., Shi, M., Wang, L., Yan, J., Gong, J., Zhang, Q., He, J., & Wu, S. (2023). Placental malfunction, fetal survival and development caused by sow metabolic disorder: The impact of maternal oxidative stress. Antioxidants, 12(2), 360.
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