Investigation of heritability and genetic correlations of milk traits in sheep

Petrovic, M.P.; Mekić, Cvijan; Ruzic, Dragana; Žujović, M.

doi:10.2298/bah0504055p

Cited by 2 publications

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“…The selection as constant process, is the safest way to accomplishing the genetic progress in the population (Petrovič et al, 2005), and according to some authors it is also the best tool for maintaining of the biodiversity (Kosgey, 2004). However, this method is quite slow, as a consequence of the biological limit of sheep reproduction and generation interval (Mekič et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Influence of Some Factors on Daily Milk Production in Awassi Breed of Sheep in Macedonia

Paćinovski¹,

Eftimova²,

Mateva³

et al. 2014

mjas

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Several production traits of the daily milk yield (morning, noon, evening and total milk, % and amount of fats) for total of 170 heads of Awassi sheep, were analyzed during four production years (2002, 2003, 2004 and 2005). In total 1130 lactation test days were included in the study. The ewes were at the age from first to eleventh lactation. All the data were analyzed by multi-factor fixed model. The certain factor influence was studied with the F-test. The analyses were made with the set of programs SPSS (SPSS, 1994). Almost all factors (year, lactation, lambing month, month of milk control, milk control number), except fertility, had highly significant influence (P<0.001) on daily milk production (morning, noon, evening and total milk, % and amount of fats) in tested sheep population. The highhighest daily milk production was determined in sheep at their 8 th lactation and the lowest at those at 11 th lactation. Analogically to this data, the sheep of the same age produced the highest and lowest fat amount, respectively. The influence of lactation, confirmed that Awassi breed maintaines the level of high and standard milk production in older age. A typical lactation curve was determined in tested dairy sheep which starts with the highest daily lactation yield during the first milk control, and diminishes during lactation to the lowest of the last one.

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Section: Introductionmentioning

confidence: 99%

Influence of Some Factors on Daily Milk Production in Awassi Breed of Sheep in Macedonia

Paćinovski¹,

Eftimova²,

Mateva³

et al. 2014

mjas

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The effect of systematical factors on quantity and quality of sheep milk

Petrovic¹,

Ružić-Muslić²,

Žujović³

2006

BIOTEC ANIM HUSB

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Quantity and quality of sheep milk represent framework of any research and development projects which have as an objective creation of prerequisites for production of highly valued dairy products, primarily cheeses. It is a known fact that milk production in sheep varies depending on many factors of hereditary nature, but also numerous environmental factors. The major factors are: breed, condition, breeding value, order of lactation, stage/phase of lactation, number of lambed offspring, nutrition, housing and health condition. Objective of this paper was to investigate the influence of major systematical factors on milk yield and quality of milk in populations reared in the region of Stara Planina mountain. Research is main component of the project carried out in the region of Stara Planina mountain - Visok. Sheep included in the research are representatives of Pirot Pramenka and Pirot improved population. Investigation included three herds of 100-300 sheep, control of milk yield was carried out using standard method once a month, and quality of milk was determined on apparatus of the milk-test type. For processing of data in analysis of systematical influences we applied procedure of linear model, observing the effects of the year, order of lactation, type of lambing of dam and size of litter. Based on the performed research, processed and presented results we can conclude that the milk yield of investigated sheep of both genotypes varied depending on the year and lactation. The highest milk quantity was registered in the third year and third lactation, which was statistically significant in case of both genotypes. In the first and second year of research, as well as order of lactation, milk yield was different, or in other words we could observe considerable increase in the second year and second lactation, also significant. In both genotypes, values of mutual differences are neglect able and statistically insignificant. Content of fat and proteins in sheep milk from both observed populations decreased slightly from the first to third year, as well as from the first to third lactation, and observed differences were statistically significant. Sheep born as singles had slightly higher milk yield, and determined difference wasn?t statistically significant. Deviations in regard to the content of fat and proteins weren?t great, which indicated that type of lambing had no significant effect on these sheep milk traits. Breeding sheep which have lambed and reared two lambs had higher milk yield, and determined differences were statistically significant. Size of litter had no significant effect on content of fat and protein considering that established differences weren?t statistically significant.

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Investigation of heritability and genetic correlations of milk traits in sheep

Cited by 2 publications

References 0 publications

Influence of Some Factors on Daily Milk Production in Awassi Breed of Sheep in Macedonia

Influence of Some Factors on Daily Milk Production in Awassi Breed of Sheep in Macedonia

The effect of systematical factors on quantity and quality of sheep milk

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