Application of two models to the lactation curve of Massese ewes

Franci, O.; Pugliese, Carolina; Acciaioli, Anna; Parisi, Giuliana; Lucifero, M.

doi:10.1016/s0921-4488(98)00130-8

Cited by 24 publications

(21 citation statements)

References 10 publications

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“…Nevertheless, the duplicated alleles might have negative pleiotropic effects represented by reduced fecundity and greater seasonality in reproduction as evidenced in Icelandic sheep for the A Wt allele or by decreased fertilization rate as reported for a grey allele (Adalsteinsson, 1970 and1975). Massese sheep are characterized by a partial seasonality of oestrus, which can occur at any time during the year (Franci et al, 1999), and this trait could be due to the usual black coat colour that might exclude or maintain in heterozygosity the duplicated copy allele(s) with putative negative effects when homozygous. Further studies are needed to evaluate the effects of ASIP alleles on production and reproduction traits in the Massese breed.…”

Section: Discussionmentioning

confidence: 99%

Coat colours in the Massese sheep breed are associated with mutations in the agouti signalling protein (ASIP) and melanocortin 1 receptor (MC1R) genes

Fontanesi

Dall’Olio

Beretti

et al. 2011

Animal

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Massese is an Italian dairy sheep breed characterized by animals with black skin and horns and black or apparent grey hairs. Owing to the presence of these two coat colour types, this breed can be considered an interesting model to evaluate the effects of coat colour gene polymorphisms on this phenotypic trait. Two main loci have been already shown to affect coat colour in sheep: Agouti and Extension coding for the agouti signalling protein (ASIP) and melanocortin 1 receptor (MC1R) genes, respectively. The Agouti locus is affected by a large duplication including the ASIP gene that may determine the Agouti white and tan allele (A Wt ). Other disrupting or partially inactivating mutations have been identified in exon 2 (a deletion of 5 bp, D 5 ; and a deletion of 9 bp, D 9 ) and in exon 4 (g.5172T.A, p.C126S) of the ASIP gene. Three missense mutations in the sheep MC1R gene cause the dominant black E D allele (p.M73K and p.D121N) and the putative recessive e allele (p.R67C). Here, we analysed these ASIP and MC1R mutations in 161 Massese sheep collected from four flocks. The presence of one duplicated copy allele including the ASIP gene was associated with grey coat colour (P 5 9.4E-30). Almost all animals with a duplicated copy allele (37 out of 41) showed uniform apparent grey hair and almost all animals without a duplicated allele (117 out of 120) were completely black. Different forms of duplicated alleles were identified in Massese sheep including, in almost all cases, copies with exon 2 disrupting or partially inactivating mutations making these alleles different from the A Wt allele. A few exceptions were observed in the association between ASIP polymorphisms and coat colour: three grey sheep did not carry any duplicated copy allele and four black animals carried a duplicated copy allele. Of the latter four sheep, two carried the E D allele of the MC1R gene that may be the cause of their black coat colour. The coat colour of all other black animals may be determined by non-functional ASIP alleles (non-agouti alleles, A a ) and in a few cases by the E D Extension allele. At least three frequent ASIP haplotypes ([D 5 :g.5172T], [N:g.5172A] and [D 5 :g.5172A]) were detected (organized into six different diplotypes). In conclusion, the results indicated that coat colours in the Massese sheep breed are mainly derived by combining ASIP and MC1R mutations.

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Section: Discussionmentioning

confidence: 99%

Coat colours in the Massese sheep breed are associated with mutations in the agouti signalling protein (ASIP) and melanocortin 1 receptor (MC1R) genes

Fontanesi

Dall’Olio

Beretti

et al. 2011

Animal

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“…The ®rst record occurred between 8±15 days from lambing when the newborns were separated from their mothers. As described in a previous paper (Franci et al, 1999) the ®rst 37 lambings occurred in autumn (September± November), after which all the ewes were again continuously exposed to mating, according to the usual breeding system with Massese, that leaves the ram in the¯ock year-round. Fifteen ewes then conceived and lambed again in March±April, after a dryoff period of about one month.…”

Section: Methodsmentioning

confidence: 98%

“…An earlier study (Franci et al, 1999) on the application of non-linear models for these milk yields showed that peak production was very early, at an average of 10 days postpartum. Since the present study, which is mainly concerned with milk quality variables, did not consider any control during the ®rst week postpartum, as instead was done in the earlier paper (Franci et al, 1999), it was decided to use a linear model (a third degree regression) to study milk yield as well.…”

Section: Effect Of Type Of Lactation and Stage Of Lactation On Milk Tmentioning

confidence: 99%

“…Since the present study, which is mainly concerned with milk quality variables, did not consider any control during the ®rst week postpartum, as instead was done in the earlier paper (Franci et al, 1999), it was decided to use a linear model (a third degree regression) to study milk yield as well. The lactation curves for all three lactation types are therefore shown in their descending phase (Fig.…”

Section: Effect Of Type Of Lactation and Stage Of Lactation On Milk Tmentioning

confidence: 99%

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Evolution of chemical composition, somatic cell count and renneting properties of the milk of Massese ewes

Pugliese

Acciaioli

Rapaccini

et al. 1999

Small Ruminant Research

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The experiment was carried out on 52 lactations of 37 multiparous Massese ewes. Because of the mating practice of the breed, three types of lactation were detected: Type 1, a short lactation initiated in autumn; Type 2, a short lactation initiated in spring, following the Type 1 lactation; Type 3, a long lactation initiated in autumn. Milk yield was recorded weekly, starting not before the eighth day from lambing. On a total 984 milk samples, contents of fat, protein, casein and lactose, SCC, pH and clotting parameters (R, K20 and A30) were determined. Data were analysed by a mixed model including lactation order, lactation type, DIM, and individual lactation as random effects. Protein and casein content increased from the second to ®fth lactation; the highest fat content was detected in the sixth lactation and over; milk of fourth lactation had higher SCC and worse renneting properties than that of second lactation. The pattern of evolution of parameters within the three types of lactation showed that the increase of nutrients with DIM was particularly noticeable for fat content in the Type 2 lactation (spring/short) which exhibited, at an average of 94 DIM, 1.5 percentage units above the other two types. Evolution of lactodynamographic parameters indicates that generally there was a substantial improvement in cheese-making suitability during the ®rst 2±3 months postpartum, and a worsening thereafter. The Type 2 lactation yielded milk with better renneting properties, particularly with respect to milk obtained during the same season from ewes that had an autumn delivery. This suggested that the newly started milk from the spring lactation could have a corrective effect on the total amount of bulk milk produced, a possible advantage for the Massese breed, which is characterised by a particularly pronounced deseasonalisation of lambings. #

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“…Building of curves by using Wood's model and their correction by using a non-linear modification, is recommended in this case (Cappio-Borlino et al, 1995). This gives better results and more accurately reflects the performances of milk production during lactation (Portolano et al, 1996;Todaro et al, 1997;Franci et al, 1999). Goodness of fit statistics of the three model curves had high values (R 2 = 0.89, 0.86, 0.82 for Alpine breed, crossbreed and local breed, respectively).…”

Section: Cappio-borlino First Lactation Curvesmentioning

confidence: 99%

Effects on milk production in F₁crossbred of Alpine goat breed (♂) and Albanian goat breed (♀)

Kume

Papa

Hajno³

2012

Italian Journal of Animal Science

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About 950,000 goats, farmed mostly in hilly and mountainous areas of Albania, contribute about 8% of the country's total milk production. In order to increase milk production, farmers are currently using crosses of the local goat breed with exotic breeds, mainly the Alpine breed from France. This study examines milk production data of first lactation from 45 goats of the local breed, 82 goats of the Alpine breed and 58 F1 crosses (♂Alpine breed x ♀local breed). The goats were kept on small-scale farms according to the traditional Albanian system. Milking was carried out in the morning and evening. Kids were weaned at 65 days of age after which milking started. Milk yield was recorded twice with a 15-day interval between the two readings. Total milk yield was calculated using the Fleischmann method. The F1 goats produced 37.8 kg more milk than local breed goats although the lactation length (P<0.05) of F1 goats was six days shorter compared to that of local breed goats (P<0.05). Analysis of variance showed a highly significant effect (P<0.01) of the genotype factor on milk production. The average Cappio-Borlino curves of three genotypes indicated that the lactation curves of local breed and F1 crosses were similar. Although the F1 cross goats had 50% of their genomes from a genetically improved breed they were still able to deal with the difficult conditions that characterize the traditional extensive farming systems in Albania. Breeding pure Alpine breed or its crosses with the local goat breed improved milk production in an extensive traditional system.

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Application of two models to the lactation curve of Massese ewes

Cited by 24 publications

References 10 publications

Coat colours in the Massese sheep breed are associated with mutations in the agouti signalling protein (ASIP) and melanocortin 1 receptor (MC1R) genes

Coat colours in the Massese sheep breed are associated with mutations in the agouti signalling protein (ASIP) and melanocortin 1 receptor (MC1R) genes

Evolution of chemical composition, somatic cell count and renneting properties of the milk of Massese ewes

Effects on milk production in F₁crossbred of Alpine goat breed (♂) and Albanian goat breed (♀)

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Application of two models to the lactation curve of Massese ewes

Cited by 24 publications

References 10 publications

Coat colours in the Massese sheep breed are associated with mutations in the agouti signalling protein (ASIP) and melanocortin 1 receptor (MC1R) genes

Coat colours in the Massese sheep breed are associated with mutations in the agouti signalling protein (ASIP) and melanocortin 1 receptor (MC1R) genes

Evolution of chemical composition, somatic cell count and renneting properties of the milk of Massese ewes

Effects on milk production in F1crossbred of Alpine goat breed (♂) and Albanian goat breed (♀)

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Product

Resources

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Effects on milk production in F₁crossbred of Alpine goat breed (♂) and Albanian goat breed (♀)