Relationship between mammary morphology traits and milk yield of Sicilo-Sarde dairy sheep in Tunisia

Ayadi, Moez; Such, X.; Ezzehizi, N.; Zouari, M.; Najar, Taha; Rad, M. Ben M’; Casals, R.

doi:10.1016/j.smallrumres.2010.10.013

Cited by 30 publications

(37 citation statements)

References 18 publications

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“…This result agrees with those reported in Manchega and Lacuane dairy ewes (Rovai et al, 1999;. Except for the distance between teats, no significant correlations between teat morphology traits and milk production were observed; these results were in accordance to those findings by Labussière (1988), Dzidic et al (2004) and Ayadi et al (2011). The udder depth, width and circumference measurements in this study were greater than the values reported for Sicilo-Sarde dairy ewes (Ayadi et al, 2011), but similar to those reported for Manchega, Lacaune and Merino Rambouillet dairy ewes Ochoa-Cordero et al, 2006;Rovai et al, 2008).…”

Section: Discussionsupporting

confidence: 93%

“…The udder depth, width and circumference measurements in this study were greater than the values reported for Sicilo-Sarde dairy ewes (Ayadi et al, 2011), but similar to those reported for Manchega, Lacaune and Merino Rambouillet dairy ewes Ochoa-Cordero et al, 2006;Rovai et al, 2008). Correlations between udder traits and daily milk yield were positively significant (p < 0.05) during suckling and milking periods, which is in agreement with previous reports by Labussiere (1988), Arranz et al (1989), Fernández et al (1995, Rovai et al (2008) and Ayadi et al (2011).…”

Section: Discussioncontrasting

confidence: 91%

“…East Friesian crossbred, Manchega, Sicilo-Sarde) and small-cisterned ewes that resembled unselected or non-dairy sheep. The percentages of Najdi's cisternal milk (55% and 67% during suckling and milking periods, respectively) were similar to the percentages reported in Manchega ewes (Rovai et al, 2002;Castillo et al, 2009), East Friesian crossbred dairy ewes (McKusick et al, 2002b) and Sicilo-Sarde dairy ewes (Ayadi et al, 2011). On the other hand, the percentages of cisternal milk in the current study were lower than those percentages in Lacuane (74-77%, Rovai et al, 2002;Castillo et al, 2009) and Sarda ewes (82%, Nudda et al, 2000).…”

Section: Discussionsupporting

confidence: 84%

“…The milk yields drop was also observed in Manchega ewes (Gargouri et al, 1993), Lacaune and Awassi breeds (Labussière, 1988) and in Sicilo-Srade dairy ewes (Ayadi et al, 2011); the average drop ranged from 30 to 49%. This drop can be explained by the partial disappearance of the stimulus produced by the lamb when suckling.…”

Section: Discussionmentioning

confidence: 63%

“…Najdi ewes had shorter teat length than Manchega, Lacaune, Istrian dairy crossbred and Bergamasca ewes (Rovai et al, 1999;Dzidic et al, 2004;Emediato et al, 2008), but in contrary, it had longer teat length than Sicilo-Sarde and Merino Rambouillet dairy ewes (Ochoa-Cordero et al, 2006;Ayadi et al, 2011). The teat lengths of Najdi ewes did not show any change throughout lactation, which is similar to the results reported by Ochoa-Cordero et al (2006) in Merino Rambouillet dairy ewes.…”

Section: Discussionmentioning

confidence: 99%

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Evolution of udder morphology, alveolar and cisternal milk compartment during lactation and their relationship with milk yield in Najdi sheep

Ayadi

Matar

Aljumaah

et al. 2014

Span. j. agric. res.

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A total of 30 multiparous Najdi ewes were used to study the evolution of udder morphology traits and milk fractions in the udder during suckling (3rd, 6th, 9thwk) and milking (10th, 11th, 12thwk) periods. During suckling period, daily milk yield was estimated by using the double oxytocin injections method 4-h after milking. During milking period, ewes were hand-milked once daily. Udder and teat morphology traits for all ewes were measured 4-h after milking. Udder compartments were evaluated 8-h after milking by using atosiban and oxytocin; milk samples of each fraction were collected. Najdi ewes had a medium and healthy udders (CMT<1), with medium sized teats (length, 3.2±0.1 cm and width, 1.7±0.1 cm) attached at 35.7 ± 11º angle. Milk yield averaged 1.88±0.18 and 0.44±0.12 L d-1 during suckling and milking periods, respectively. A drop in milk yield (-75%, p<0.01) was found in the transition from suckling to milking. Udder traits, teats angle and width, and distance between teats declined (p<0.05) throughout lactation, whereas teat lengths did not show any change. Positive correlations (p<0.05) were observed between milk yield and udder depth (r=0.47-0.49), width (r=0.31-0.39) and distance between teats (r=0.26-0.39). The cisternal milk volumes decreased (p<0.05) after weaning, whilst the corresponding percentages increased (p<0.05). Cisternal milk accounted for 55% and 67% of the total udder milk during suckling and milking periods, respectively. Cisternal milk was positively correlated (r=0.93, p<0.05) with total milk yield. The percentages of protein and total solids in alveolar and cisternal milk increased significantly (p<0.05) after weaning, whilst fat percentages in cisternal milk did not change. In conclusion, the evaluated Najdi ewes showed medium sized cisterns and teats, which considered adequate for machine milking. Udder morphology traits had positive correlations with milk yield and hence, can be utilized in breeding programs.

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Section: Discussionsupporting

confidence: 93%

Section: Discussioncontrasting

confidence: 91%

Section: Discussionsupporting

confidence: 84%

Section: Discussionmentioning

confidence: 63%

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Evolution of udder morphology, alveolar and cisternal milk compartment during lactation and their relationship with milk yield in Najdi sheep

Ayadi

Matar

Aljumaah

et al. 2014

Span. j. agric. res.

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Production GH transgenic goat improving mammogenesis by somatic cell nuclear transfer

et al. 2014

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Growth hormone is a positive regulator of mammary gland development. Dairy animals that are administered growth hormone display enhanced lactation performance, a desirable agricultural trait. The objective of the current research was to generate an improved milk production phenotype in a large animal model using over-expressed GH in the mammary gland to promote mammogenesis. To this end, we constructed a mammary gland-specific expression vector, pcGH, and demonstrated effective GH expression in goat mammary epithelial cells in vitro by ELISA. Then, to produce transgenic offspring that were capable of stable GH expression in vivo, the linearized pcGH vector was electroporated into goat fetal fibroblasts. Cell colonies that were positive for GH were used as donors for nuclear transfer to enucleated oocytes. A total of 253 morulae or blastocytes developed from the reconstructed embryos were transferred to 56 recipients, resulting in 24 pregnancies at day 35. Finally, six transgenic goats were born. PCR detection confirmed the success of the cloning procedure. To observe the mammogenesis of dairy goats, the GH transgenic goats were mated with a completely healthy buck. In the later pregnancy period, the mammary gland of the GH transgenic goats were extensive than non-transgenic goats. These experiments indicated that the pcGH vector was incorporated into the transgenic goats and affected mammogenesis, which laid a solid foundation for elucidating the impact of GH on mammogenesis and lactation performance.

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Evaluation of type traits in relation to production, and their importance in early selection for milk performance in dairy buffaloes

Zhang

Niu

et al. 2022

animal

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Relationship between mammary morphology traits and milk yield of Sicilo-Sarde dairy sheep in Tunisia

Cited by 30 publications

References 18 publications

Evolution of udder morphology, alveolar and cisternal milk compartment during lactation and their relationship with milk yield in Najdi sheep

Evolution of udder morphology, alveolar and cisternal milk compartment during lactation and their relationship with milk yield in Najdi sheep

Production GH transgenic goat improving mammogenesis by somatic cell nuclear transfer

Evaluation of type traits in relation to production, and their importance in early selection for milk performance in dairy buffaloes

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