닭의 크기는 왜 전보다 4배나 커졌을까? Chickens Look Way Different Today, And Here's The Reason Why

 

 

닭은 변했다.   요즘 주로 사육하는 닭 '브로일러'는 몇십년 전 브로일러보다 몇 배나 덩치가 크다.   CBC 뉴스에 따르면 캐나다의 한 연구진은 닭의 몸집이 얼마나 커졌는지를 연구하기 위해 세 가지 다른 품종의 닭을 직접 키웠다. 하나는 1957년, 또 하나는 1978년, 다른 하나는 2005년에 주로 키우던 품종의 닭이다.   이번 연구를 주도한 알버타 대학의 농과대 교수 마틴 주이드호프 박사는 CBC와의 인터뷰에서 "우리는 세 마리 닭에게 정확하게 같은 양의 사료를 먹였고, 어떠한 호르몬제도 공급하지 않았다"고 말했다. Huffington Post  | 작성자 Jacqueline Howard

 

 

Chickens Look Way Different Today,

And Here's The Reason Why

Chickens have changed. Today's broiler chickens are several times larger than broiler chickens of past decades -- and a new study by researchers in Canada offers an explanation for why the birds got so big.   The chickens shown were all raised in the same manner and photographed at the same age. The Huffington Post added the dates to this image. (Poultry Science, Advanced Access, (2014) doi: 10.3382/ps.2014-04291, Figure 1) (Zuidhof et al, “Growth, efficiency, and yield of commercial broilers from 1957, 1978, and 2005") For the study, the scientists raised three breeds of broiler chickens: one breed that was common in 1957, another from 1978, and a third from 2005, called the Ross 308 breed, CBC News reported.   "We fed them exactly the same things, so we did not provide hormones," lead author Dr. Martin Zuidhof, associate professor of agricultural science at the University of Alberta, told the CBC. "The only difference that was part of our study treatments was the genetics."   (The U.S. Food and Drug Administration has long banned the use of hormones in poultry production.)   What did the researchers find? The Ross 308 chickens grew to be much bigger than the 1978 breed and four times larger than the 1957 breed.   "We had never actually tested our 1978 line before, but where they fell were very consistent with what we believed would be the case based on historical selection for growth rate and efficiency," Zuidhof told the Canadian news channel CTV.   In other words, today's chickens are bigger simply because they were bred to be bigger. Should we be concerned about eating these big birds?   "There is no danger in eating larger chickens," Zuidhof told The Huffington Post in an email. "That would be comparable to saying it is more dangerous to eat bigger carrots because they’re bigger." The study was published online in the journal Poultry Science on September 26, 2014 huffingtonpost

"from past to future"
Arts & Culture
conpaper

 

.