Epigenetics TREND for some Productive and Reproductive Traits of Friesian Cattle Raised in Egypt | ||||
| Journal of Animal and Poultry Production | ||||
| Article 8, Volume 8, Issue 7, July 2017, Page 195-202 PDF (510.04 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2017.45848 | ||||
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| Authors | ||||
| Safaa S. Sanad; M. G . Gharib | ||||
| Animal production research Institute – Research center – Egypt. | ||||
| Abstract | ||||
| The objectives of this study were to estimate the genetic parameters and Epigenetics TREND (EP) of milk traits of herd of Friesian in Egypt. The studied traits were 305 day milk yield (305d-MY, kg),total milk yield (TMY, kg), Lactation period (LP, day), days open (DO) and number of services per conception (NSC, services).The data included 1794 records of 704 cows daughters of 86 bulls and 439 damduring the years 2007to 2016 were collected from Alkarda farm (Government farm) located in Kafr El-Sheikh, Egypt. Single-Trait animal model was used to estimate genetic parameter; overall means of 305-dayMY, TMY, LP, DO and NCS were 2935Kg, 3320 Kg , 310 day, 151 day and 1.7 services, respectively, Additive heritability (ha) estimated for 305d-MY, TMY, LP DO and NSC were 0.34, 0.31, 0.29, 0.06 and 0.26,respectively. While maternal heritability (hm) were 0.03, 0.07, 0.05, 0.01 and 0.002, respectively , The environmental impact of the permanent lower corresponding values were 0.0031, 0.0027, 0.0037, 0.0062 and 0.0038, respectively.Indicating that the effect of animals' genetic performance is affected by the surrounding environmental conditions where full care through the mother leads to improvement of the studied traits.The genetic and phenotypic correlations of most of the studied traits were highly significant (p <0.001) and ranged from -0.22 to 0.46for geneticcorrelationbetween traits whilephenotypic correlation ranged from -0.11 to 0.65.Genetic trends were positive for all studied traits except for days open and NSC. Range of breeding value (BV)for all studied traits of cows (2800.8, 3297.6, 304.8, 50.7 and 0.91) respectively were higher than those of sires (1515.5, 1687.9, 152.8, 40.6 and 0.66) and dam (1123.7, 2248.5, 179.4,38.3 and 0.66) respectively. Therefore, the selection of cows for the productive traits studied on the basis of the BV of the cow is more efficient to produce a significant genetic improvement of the milk production traits in the cows by selection, as well as the attention to good care for the improvement of reproductive traits studied (DO and NCS). The impact of the genetic performance of cows on surrounding environmental conditions, such as the effect of the year ,season ofbirth and parity , has been shown to have a negative effect at some of these levels, We conclude from the study that the selection of cows on the basis of BV with increased care and good nutrition will result in the herd to show its full genetic capacity, which will increase the productivity of the herd and contribute to the future using this herd leading to increased production. | ||||
| Keywords | ||||
| Friesian; heritability; Additive; Maternal effects; environmental effects; Epigenetics TREND (EP) | ||||
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