Modelling milk yield, milk components and body composition changes in the lactating sow

Walker, Brian; Young, Bruce A.

doi:10.1016/0301-6226(92)90043-4

Cited by 7 publications

(6 citation statements)

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“…This may be because physiological development of reproductive organs differs with parity (Oh et al, 2006). Thus, milk production in gilts may be 20% lower than in multiparous sows, as a consequence of lower feed intake and additional requirements of energy for tissue growth (Walker & Young, 1993). Therefore, sow performance during the first parity may not be used to predict its performance in future parities, particularly in D21LWT.…”

Section: Resultsmentioning

confidence: 93%

Estimation of genetic and phenotypic parameters for sow productivity traits in South African Large White pigs

Dube¹,

Mulugeta²,

Dzama³

2012

SA J. An. Sci.

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________________________________________________________________________________ AbstractThe objective of the study was to estimate genetic and phenotypic parameters for sow productivity traits of South African Large White pigs, using data from the Integrated Registration and Genetic Information Systems. The analyses were done on 29 719 records for 7 983 sows from 29 herds, which farrowed between 1990 and 2008. Data were analysed as a sow trait using a repeatability animal model. The traits analysed were number of piglets born alive (NBA), litter birth weight (LBWT), 21-day litter size (D21LS) and 21-day litter weight (D21LWT). Estimates of heritability for these traits were 0.07 ± 0.01, 0.11 ± 0.01, 0.03 ± 0.01 and 0.06 ± 0.01, respectively. The respective repeatability estimates for the traits were 0.15 ± 0.01, 0.16 ± 0.01, 0.11 ± 0.01 and 0.12 ± 0.01. Genetic correlations among the traits ranged from 0.32 ± 0.07 between NBA and D21LWT to 0.88 ± 0.04 between NBA and D21LS. The phenotypic correlations ranged from 0.35 ± 0.01 between NBA and D21LWT to 0.75 ± 0.01 between NBA and LBWT. Litter traits at birth were more heritable and repeatable than traits measured at 21 days of age. In general, all traits showed positive genetic and phenotypic trends for the period studied. The heritability of sow productivity traits was low and less repeatable, which suggests that response to selection may be slow and that the performance in the first parity may not always predict future performance. However, because of their economic importance, an attempt should always be made to keep these traits at their optimum.

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Section: Resultsmentioning

confidence: 93%

Estimation of genetic and phenotypic parameters for sow productivity traits in South African Large White pigs

Dube¹,

Mulugeta²,

Dzama³

2012

SA J. An. Sci.

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“…Mothering ability measured by LW21 may be considered as a composite trait, combining litter size and average piglet weight at 21 days, which depend on the number of piglets born and the piglets preweaning survival and growth. Milk production in gilts may be 20% lower than in multiparous sows, as a consequence of lower feed intake and additional requirements of energy for tissue growth (Walker and Young, 1993). According to the estimated parity effects on LW21, the best mothering ability of Torbiscal sows is achieved at parity 2 and it slightly decreases in the later parities, being similar the maternal aptitude of sows at the parities 1 and 5.…”

Section: Analysis With Repeatability Animal Model (Rm)mentioning

confidence: 99%

Genetic parameters for litter size and weight at different parities in Iberian pigs

Fernández¹,

Rodrigáñez²,

Zuzúarregui³

et al. 2008

Span. j. agric. res.

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Genetic progress for reproductive performance in pigs is limited by mothering ability. It is a critical aspect for dam lines, in which litter weight at weaning could be included with litter size in the selection goal. Our objective was to investigate in Iberian pigs the genetic basis of the number of alive born piglets (NBA) and the litter weight at 21days (LW21) over the successive parities (t). Records for NBA were available from 6,775 litters born from 1,893 sows of the Torbiscal line, and LW21 records proceeded from 1,431 sows and 2,963 litters without crossfostering. Genetic parameters were estimated using an animal model with repeatability, a multi-trait animal model, and a random regression model. Estimated values of heritabilities for NBA and genetic correlations between parities confirm a partially different genetic control of prolificacy at parity 1 and at later parities. Results for LW21 indicate that this trait may be partially controlled by different genes at the first two parities and at the later ones. Estimated genetic parameters for NBA (t = 1), NBA (t ≥ 2), LW21 (t ≤ 2) and LW21 (t ≥ 3) were: heritability, h 2 = 0.15, 0.12, 0.22 and 0.15, respectively, and coefficient of permanent environmental effects, p 2 = 0.05, 0.02 and 0.24, respectively for the three last traits. The values of genetic correlations ranged from 0.44 to 0.84. A multitrait approach would be useful to estimate accurate genetic parameters, and to improve the low persistency of reproductive performance in the later parities of Iberian sows.Additional key words: genetic correlation, maternal ability, prolificacy, random regression model. ResumenEvaluación genética del tamaño y peso de camada para sucesivos partos en cerdas Ibéricas La mejora genética de la eficiencia reproductiva en cerdos está limitada por su aptitud maternal. Es éste un aspecto crítico en las líneas maternas, en las que el peso de la camada al destete podría ser incluido junto al tamaño de camada en el objetivo de selección. El objetivo del trabajo fue investigar en cerdos Ibéricos la base genética del núme-ro de lechones nacidos vivos (NBA) y el peso de camada a 21días (LW21) a lo largo de los sucesivos partos (t). Se dispuso de registros de NBA de 6.775 camadas nacidas de 1.893 cerdas, y registros de LW21 procedentes de 1.431 cerdas y 2.963 camadas sin adopciones. Se estimaron parámetros genéticos mediante tres modelos: con repetibilidad, multicarácter y de regresión aleatoria. Los valores de las heredabilidades y las correlaciones genéticas entre NBA en diferentes partos confirman su control genético, parcialmente distinto en el parto primero y posteriores. Los resultados para LW21 indican que este carácter puede estar parcialmente controlado por diferentes genes en los dos primeros partos y en los sucesivos. Los parámetros genéticos estimados para NBA (t = 1), NBA (t ≥ 2), LW21 (t ≤ 2) y LW21 (t ≥ 3) fueron: heredabilidad, h 2 = 0,15, 0,12, 0,22 y 0,15, respectivamente, y coeficiente de efectos de ambiente permanente, p 2 = 0,05, 0,02 y 0,24, respec...

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“…Although sow lactation and pre‐weaning growth of piglets are of increasing physiological and productive interest ( van der S teen and de G root 1993; W alker and Y oung 1993), genetic studies are restricted by the need for a large amount of data not usually recorded in breeding programmes. One practical measure of sow milk production is the litter weight, assuming the only feed of the piglets is their milk intake.…”

Section: Introductionmentioning

confidence: 99%

Genetic analysis of maternal ability in Iberian pigs

Rodrı́guez¹,

Rodrigáñez²,

Silió³

1994

J Animal Breeding Genetics

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A practical measure of milk yield of the sow is the weight of the litter at three weeks of age when the piglet growth is entirely dependent on the milking ability of the dam. Genetic parameters of litter size at birth (LS) and litter weight at 21 days (LW21) were estimated using a DFREML procedure from records of 4883 litters (2,049 for LW21) of Iberian breed. Preliminary analysis showed negligible maternal genetic effects. The model for both traits included the fixed effects of farrowing period (86 levels), parity (6) and inbreeding coefficients of dam (Fd) and litter (F(1) ) as co-variables, and three random effects-additive genetic value, permanent environmental effect and residual on both traits. Heritability and repeatability estimates were 0.064 and 0.126 (LS) and 0.163 and 0.270 (LW21) respectively. Estimated genetic and phenotypic correlations were 0.214 and 0.043. The inbreeding depression per 10 % increase of Fd or F(1) was -0.150 or -0.170 in live piglets and -0.983 or -1.023 kg of litter weight. When the model for LW21 included the dam inbreeding and the number of suckling piglets as co-variables, the heritability and repeatability estimates were 0.243 and 0.431 respectively. A complementary analysis was carried out on individual records (weight at 21 days) of 26206 piglets farrowed by 1317 sows. The model included the fixed effects of sex, farrowing period, parity, and the inbreeding coefficients of dam and individual, as co-variables. A total of four random effects were also included: direct and maternal genetic effects, common environmental effects and residual. Estimates of heritability, maternal heritability and common environmental coefficient were, respectively, 0.019, 0.163 and 0.128, reinforcing the evidence of genetic variance for milk producing ability in Iberian sows. The estimated values of inbreeding depression for piglet weight at 21 days were -0.072 and -0.098 kg per 10 % increase in dam or litter inbreeding. ZUSAMMENFASSUNG: Genetische Analyse von Muttereigenschaften iberischer Schweine Ein praktisches Maß für Milchleistung von Sauen ist das Drei-Wochen-Wurfgewicht, das völlig von der Muttermilchleistung abhängt. Genetische Parameter für Geburtswurfgröße (LS) und Geburtswurfgewicht bei 21 Tagen (LW21) wurden mit DFREML von 4883 Würfen (2049 für LW21) geschätzt. Vorläufige Analysen zeigten vernachläßigbare maternale Wirkungen. Das Modell enthält fixe Wirkungen der Wurfperiode (86), Wurffolge (6) und Inzuchtkoeffizienten von Muttersau (Fd) und Wurf (F(1) ) als Ko-variable und dazu drei zufällige Wirkungen: additiv-genetischer Wert, permanenter Umwelteinfluß und der Rest, bei beiden Merkmalen. Heritabilität und Wiederholbarkeit wurden auf 0,064 und 0,126 (LS) und auf 0,163 und 0,270 (LW21) geschätzt. Genetische und phänotypische Korrelationen waren 0,214 bzw. 0,043. Inzuchtdepression pro 10 % für Fd bzw. Fl waren -0,15 bzw. -0,17 bei lebenden Ferkeln und -0,983 bzw. -1,023 Kg in Wurfgewicht. Wenn im Modell für LW21 Mutterinzucht und Zahl saugender Ferkel berücksichtigt wurde, waren die H...

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Modelling milk yield, milk components and body composition changes in the lactating sow

Cited by 7 publications

References 47 publications

Estimation of genetic and phenotypic parameters for sow productivity traits in South African Large White pigs

Estimation of genetic and phenotypic parameters for sow productivity traits in South African Large White pigs

Genetic parameters for litter size and weight at different parities in Iberian pigs

Genetic analysis of maternal ability in Iberian pigs

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