Impact of parity and litter size on dairy traits in Istrian ewes

Kasap, Ante; Špehar, Marija; Držaić, Valentino; Mulc, Danijel; Barać, Zdravko; Antunović, Zvonko; Mioč, Boro

doi:10.5513/jcea01/20.2.2169

Cited by 6 publications

(3 citation statements)

References 7 publications

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“…In addition, in cull ewes, the monitoring of adipose depots by in vivo RTU can enhance feeding strategies to improve the marketability of the carcasses. However, more studies are necessary to develop prediction models adapted to each breed type and verify the influence on the predictive value of such models of factors that, within each breed, affect milk production, such as parity (Casoli et al ., 1989; Kasap et al ., 2019), in order to obtain a better understanding of the effect of breed differences on such models and maximize their predictive value for each breed.…”

Section: Discussionmentioning

confidence: 99%

Using real-time ultrasound for in vivo assessment of carcass and internal adipose depots of dairy sheep

Afonso¹,

Guedes

Teixeira

et al. 2019

J. Agric. Sci.

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Fifty-one Churra da Terra Quente ewes (4–7 years old) were used to analyse the potential of real-time ultrasound (RTU) to predict the amount of internal adipose depots, in addition to carcass fat (CF). The prediction models were developed from live weight (LW) and RTU measurements taken at eight different locations. After correlation and multiple linear regression analysis, the prediction models were evaluated by k-fold cross-validation and through the ratio of prediction to deviation (RPD). All prediction models included at least one RTU measurement as an independent variable. Prediction models for the absolute weight of the different adipose depots showed higher accuracy than prediction models for fat content per kg of LW. The former showed to be very good or excellent (2.4 ⩽ RPD ⩽ 3.8) for all adipose depots except mesenteric fat (MesF) and thoracic fat, with the model for MesF still providing useful information (RPD = 1.8). Prediction models for fat content per kg of LW were also very good or excellent for subcutaneous fat, intermuscular fat, CF and body fat (2.6 ⩽ RPD ⩽ 3.2), while the best prediction models for omental fat, kidney knob, channel fat and internal fat still provided useful information. Despite some loss in the accuracy of the estimates obtained, there was a similar pattern in terms of RPD for models developed from LW and RTU measurements taken just at the level of the 11th thoracic vertebra. In vivo RTU measurements showed the potential to monitor changes in ewe internal fat reserves as well as in CF.

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Section: Discussionmentioning

confidence: 99%

Using real-time ultrasound for in vivo assessment of carcass and internal adipose depots of dairy sheep

Afonso¹,

Guedes

Teixeira

et al. 2019

J. Agric. Sci.

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“…Furthermore, with the arrival of new data, we could compare additional crossbreed models (e.g., Hill, 1982;Kinghorn, 1982). The Istrian breed is under the national evaluation in Croatia for dairy traits (e.g., Kasap et al, 2019), and as such is likely candidate to be genotyped in agreement with the current trends to shift from the traditional (BLUP) to genomic selection. Availability of such genomic data will open the door for many supporting analyses that will have the power to improve crossbreed studies like this one, especially with proper breed and parentage assignment, genetic structure and admixture analyses, and most importantly missing pedigree reconstruction.…”

Section: Discussionmentioning

confidence: 99%

Inheritance of the birth weights in crosses between Istrian, Awassi, East-Friesian and Travnik Pramenka sheep in Croatia: a case study

Pocrnić¹,

Džidić²

2021

JCEA

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The purpose of the study was to estimate the influence of the additive and non-additive genetic effects on the birth weight, using two different crossbreed models. Data on 1176 birth weights were collected. The animals were crosses, with different ratios of Awassi, East-Friesian, Istrian, and Travnik Pramenka sheep breed. The focal breed in this study was Istrian, which is an autochthonous breed in Croatia. In both models mixed procedure was used with random effect of sire and fixed effects of sex, year and month of birth, litter size, and direct inbreeding. The first model contained the additive breed effects, while the second model additionally included non-additive effects of heterosis and recombination loss.Sex, litter size, year and month of birth significantly affected birth weight in both models. Effect of direct inbreeding was negative and significant only in second model. Significant positive additive breed effect was estimated for Awassi breed in both models. The East-Friesian additive breed effect was positive in both models, but it was significant for the first one only. The positive and significant heterosis effect for the birth weight was estimated for the crosses between East-Friesian and Travnik Pramenka, as well as between Travnik Pramenka and Istrian breed. Same crosses showed significant and positive effect of recombination loss. The negative effect of recombination loss was estimated for the crosses of Awassi breed.

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“…The declining milk yield was partly due to the shortening of lactation length as ewes aged but was also due to the declining maximum secretory potential of ewes, which developed similarly to total milk yield. According to Kasap et al (2019), ewes with multiple litters had higher lactation milk yield, fat and protein yield. During the milking phase of the lactation period, ewes with multiple litters produced higher milk yield (21 kg), fat (1.62 kg), and protein (1.15 kg).…”

Section: Fixed Effects On Milk Yieldmentioning

confidence: 99%

Effects of crossbreeding on milk production of sheep

Černá,

Margetín,

Veselá

et al. 2023

Czech J. Anim. Sci.

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The aim of this study was to estimate the effects of crossbreeding on milk production and milk components in crossbred Tsigai, Lacaune, and Improved Wallachian sheep used to create a synthetic Slovak dairy sheep population. The local breeds Tsigai and Improved Wallachian were crossed with the high-yielding breed Lacaune to increase milk yield. The effects of crossbreeding were evaluated based on breed and heterosis effects. The database used consisted of 23 018 lactations from 15 888 ewes. The effects of crossbreeding on milk production and fat and protein content were estimated using the restricted maximum likelihood method in REMLF90. Fixed effects on milk yield were also studied. In ewes with a 100% heterosis effect (ewes from purebred parents of different breeds), the heterosis effect increased milk production by 11.642 kg, milk fat production by 0.772 kg, and protein production by 0.565 kg per milking period. The effect of the Tsigai breed on milk production was -21.98 kg compared to Lacaune, while for the Improved Wallachian breed, the value was -38.58 kg. The Tsigai direct breed effect reduced fat production by 1.56 kg and protein production by 1.34 kg. The Improved Wallachian direct breed effect was -2.71 kg for fat production and -2.27 kg for protein production.

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Impact of parity and litter size on dairy traits in Istrian ewes

Cited by 6 publications

References 7 publications

Using real-time ultrasound for in vivo assessment of carcass and internal adipose depots of dairy sheep

Using real-time ultrasound for in vivo assessment of carcass and internal adipose depots of dairy sheep

Inheritance of the birth weights in crosses between Istrian, Awassi, East-Friesian and Travnik Pramenka sheep in Croatia: a case study

Effects of crossbreeding on milk production of sheep

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