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Table 1 Overview of the datasets with the differences in the sexes and carcass and dietary protein contents

From: Genetic analysis of protein efficiency and its association with performance and meat quality traits under a protein-restricted diet

Study

Sex

Sires

Dams

Carcass protein determination

T1

T2

Dietary raw protein (digestible lysine content (g/kg))a

Castrated male

Female

Entire male

Grower (20–60 kg BW)

Finisher I (60–100 kg BW)

Finisher II (100–140 kg BW)

Kasper et al. [7]b, [28]

92

92

110

17

56

Chemical analysis

Control

Control A

163 (9.72)

140 (7.80)

124 (7.15)

RPGF

Treatment A

134 (7.88)

115 (6.36)

101 (5.76)

Bee et al.[26]c

24

24

–

3

9

DXA

T95

Control B

184 (11.04)

158 (8.49)

–

T100

Control B

185 (10.96)

156 (8.71)

–

T100-CF

Control C

185 (10.45)

156 (8.24)

–

Bee et al. [27]

24

24

–

4

9

DXA

Control

Control A

164 (10.07)

152 (8.13)

–

RPF

Treatment B

164 (10.07)

121 (6.56)

–

RPGF

Treatment A

132 (8.13)

121 (6.56)

–

Present study

329

352

–

39

79

DXA

RPGF

Treatment A

128 (7.80)

112 (6.06)

–

Total

469

492

110

        
  1. T1: name of the treatment group in the original study; RPGF: reduced protein diet in the grower and finisher stages; RPF: reduced protein diet in the finisher stage; T95: 95% of the feed ingredients were of organic origin; T100: 100% of the feed ingredients were of organic origin; T100-CF: 100% of the feed ingredients were of organic origin with 6% higher crude fiber content
  2. T2: assigned name of treatment group in this study based on the quantity of dietary crude protein and crude fiber
  3. aEnergy content was the same (13.4 MJ) for both the grower and finisher diets and for all experimental treatments
  4. bRP content in the study of Kasper et al. [7] was averaged over four series
  5. cFor the study of Bee et al. [26], all treatment groups had approximately the same quantity of crude protein, but T100-CF had a higher crude fiber content, hence, the different treatment group (Control C) assigned to T100-CF
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Genetics Selection Evolution

ISSN: 1297-9686