Effects of SCD1- and DGAT1-genes on production traits of Chinese Holstein cows located in the Delta Region of Yangtze River

Comparision of DGAT1 K232A Polymorphism and its Effects on some Milk Quality Parameters in Holstein and Native Black Race Cattles

“…The same researchers have also determined that the "A" allele has positive effects on milk productivity parameter. The findings of our study is similar to those of Mao et al [1] , about milk productivity.…”

“…However, our findings in milk productivity parameter are not in parallel with Sun et al's findings. On the other hand, Mao et al [1] have indicated that DGAT1 gene is effective on fat concentration, total protein amount and total milk solid matter in cattles and have determined that "K" allele affects these parameters. The same researchers have also determined that the "A" allele has positive effects on milk productivity parameter.…”

“…The results show that the cattles with high allele frequency are "AK" haplotypes. This is relatively effective on the milk productivity of the cattles with low allele frequency but medical literature reports that "AA" haplotype cattles are more productive of milk than "AK" haplotype cattles whereas the milk of the cattles with the mentioned genomic profile includes less milk fat than the milk of the cattles of the "AK" haplotype [1] .…”

“…The enzyme also carries important functions in adiposis tissue and intestinal fat absorption [1] . In European cattle races, it has been reported that the aforementioned gene may have some polymorphologic properties with the ability of lysine and alanine switching places/lysine replacing alanine in the 10433 and 10434 loci (positions) of the eighth exon (DGAT1 K232A) [2] .…”

Variation in the stearoyl-CoA desaturase gene (<i>SCD</i>) and its influence on milk fatty acid composition in late-lactation dairy cattle grazed on pasture

“…The gene (SCD) encoding for SCD is located on bovine chromosome 26, and it is expressed in a variety of tissues (Chung et al, 2000). In lactating ruminants, the expression of SCD occurs at high levels (Bernard et al, 2005;Bionaz et al, 2008;McDonald et al, 1973), and it is considered to be important with respect to milk fat composition in these animals (Gautier et al, 2006). Ntambi et al (2004) reported that dietary factors could regulate the expression of SCD, and hence the expression patterns of SCD in cows that are grazing outdoor on pasture might therefore be different to cows that are fed indoors on supplements.…”