TY  - JOUR
T1  - Effects of Growth Hormone (GH) and Growth Hormone Receptor (<I>GHR</I>) 
  Gene Polymorphisms on Milk Production Traits in Holstein and Holstein x Chinese Yellow Cattle Crosses
AU - Li, Yao-Dong AU - Ma, Yan-Nan AU - He, Peng-Jia AU - Brown, Michael A. AU - Lei, Zhao-Min AU - Zhu, Jing AU - Zhang, Hai-Rong AU - Li, Jun AU - Wu, Jian-Ping 
JO  - Journal of Animal and Veterinary Advances
VL  - 12
IS  - 14
SP  - 1210
EP  - 1216
PY  - 2013
DA  - 2001/08/19
SN  - 1680-5593
DO  - javaa.2013.1210.1216
UR  - https://makhillpublications.co/view-article.php?doi=javaa.2013.1210.1216
KW  - Cattle
KW  -Holstein cattle
KW  -Chinese Yellow
KW  -GH gene
KW  -GHR gene
KW  -polymorphism
KW  -milk production
AB  - The 3 years of data from 464 purebred Holstein and Holstein 
  cross (unimproved Holstein-Chinese Yellow cattle crosses, improved Holstein-Chinese 
  Yellow cattle crosses) cattle were used to evaluate effects of polymorphisms 
  in both GH and GHR on milk yield and quality. Traits evaluated included 305 
  days milk, milk fat, milk protein and lactose yield and 305 days milk fat, milk 
  protein and milk lactose percentage. Three genotypes and two genotypes were 
  found within the <I>GH</I> and <I>GHR</I> genes, respectively. Based on mixed 
  model least squares analyses (SAS<SUP>&reg;</SUP>, 
  Raleigh, NC, USA) there was evidence of genotypic difference for GH in 305 days 
  milk yield for improved Holstein-Chinese Yellow cattle and purebred Holstein 
  (p&lt;0.10) but only a weak trend for genotypic differences across breed groups 
  (p&lt;0.15). Genotypic differences for GH in milk fat, protein and lactose yield 
  were not evident in unimproved Holstein-Chinese Yellow cattle or purebred Holstein 
  cattle (p&gt;0.10) but there were trends for genotypic differences in milk fat, 
  protein and lactose yield in improved Holstein-Chinese Yellow cattle (p&lt;0.10). 
  There was little evidence of genotypic differences for GHR in any trait (p&gt;0.20). 
  Results from this research suggest polymorphisms in GH can affect milk yield 
  and quality but such effects may be dependent on percentage Holstein in the 
  cow.
ER  -