PMID- 25791878
OWN - NLM
STAT- MEDLINE
DCOM- 20160127
LR  - 20181202
IS  - 1573-7438 (Electronic)
IS  - 0049-4747 (Linking)
VI  - 47
IP  - 5
DP  - 2015 Jun
TI  - Determination of energy and protein requirement for maintenance and growth and 
      evaluation for the effects of gender upon nutrient requirement in Dorper x Hu 
      Crossbred Lambs.
PG  - 841-53
LID - 10.1007/s11250-015-0797-4 [doi]
AB  - This study aimed to determine energy and protein requirement of Dorper x Hu 
      crossbred lambs and further to evaluate the effect of gender upon nutrient 
      requirement parameters. Forty-two female lambs (18.60 +/- 1.57 kg) and 42 male 
      lambs (18.30 +/- 1.28 kg) were used. In comparative slaughter trial, 30 of animals 
      from each gender group were randomly selected and assigned to ad libitum (AL), 
      low restriction (LR) and high restriction (HR) group, and then were slaughtered 
      when lambs under AL treatment reached target BW of 20, 28, and 35 kg, to 
      determine body energy and nitrogen retained. In digestibility trial, remaining 12 
      female (18.01 +/- 1.66 kg) and 12 male lambs (18.43 +/- 1.17 kg) were randomly 
      assigned to three feeding treatments in accordance with the design of comparative 
      slaughter trial, to evaluate dietary energetic values at different feed intake 
      levels. The combined data indicated that metabolizable energy (ME) requirement 
      for maintenance (MEm; 400.61 +/- 20.31 vs. 427.24 +/- 18.70 kJ kg(-1) of shrunk 
      BW(0.75); SBW(0.75)), partial efficiency of ME utilization for maintenance (k m; 
      0.64 +/- 0.02 vs. 0.65 +/- 0.03), partial efficiency of ME utilization for growth (k 
      g ; 0.42 +/- 0.03 vs. 0.44 +/- 0.02), and net protein (NP) requirement for 
      maintenance (NPm; 1.83 +/- 0.17 vs. 1.99 +/- 0.28 g kg(-1) of SBW(0.75)) did not 
      differ (P > 0.05) due to gender; although not statistically different, the mean 
      value of Net energy (NE) requirement for maintenance (NEm) for male lambs 
      (260.62 +/- 13.21 kJ kg(-1) of SBW(0.75)) were 5 % greater than that 
      (274.16 +/- 11.99 kJ kg(-1) of SBW(0.75)) of female lambs. Additionally, rams have 
      greater amounts of NP requirement for growth (NPg, 15.94 to 44.32 g d(-1)) than 
      those of ewes (13.07 to 32.95 g d(-1)) at the similar condition of BW and ADG. In 
      conclusion, we suggested that our results of energy and protein requirement for 
      growth ranged between the NRC recommendation for early and later maturating 
      growing sheep, and the effect of gender upon energy requirement parameters was 
      similar in tendency but was less evidently than those frequently recommended 
      previously.
FAU - Nie, Hai Tao
AU  - Nie HT
AD  - Jiangsu Engineering Technology Research Center of Meat Sheep & Goat Industry, 
      College of Animal Science, Nanjing Agricultural University, No. 1 Wei Gang Road, 
      Nanjing, 210095, China.
FAU - Zhang, Hao
AU  - Zhang H
FAU - You, Ji Hao
AU  - You JH
FAU - Wang, Feng
AU  - Wang F
LA  - eng
PT  - Journal Article
PT  - Randomized Controlled Trial
PT  - Research Support, Non-U.S. Gov't
DEP - 20150320
PL  - United States
TA  - Trop Anim Health Prod
JT  - Tropical animal health and production
JID - 1277355
SB  - IM
MH  - Animal Feed/analysis
MH  - Animal Nutritional Physiological Phenomena
MH  - Animals
MH  - Animals, Newborn/*physiology
MH  - Body Composition
MH  - Diet/*veterinary
MH  - *Energy Metabolism
MH  - Female
MH  - Male
MH  - *Nutritional Requirements
MH  - Sheep/*physiology
EDAT- 2015/03/21 06:00
MHDA- 2016/01/28 06:00
CRDT- 2015/03/21 06:00
PHST- 2014/07/31 00:00 [received]
PHST- 2015/03/09 00:00 [accepted]
PHST- 2015/03/21 06:00 [entrez]
PHST- 2015/03/21 06:00 [pubmed]
PHST- 2016/01/28 06:00 [medline]
AID - 10.1007/s11250-015-0797-4 [doi]
PST - ppublish
SO  - Trop Anim Health Prod. 2015 Jun;47(5):841-53. doi: 10.1007/s11250-015-0797-4. 
      Epub 2015 Mar 20.