Figure 1.
Figure 1.

Experimental design with the treatment diets and the target ADG for each period and strategy.

 


Figure 2.
Figure 2.

Synchronization protocol used in beef heifers at 15 mo of age managed with different feeding treatments. PRID = progesterone releasing intravaginal device.

 


Figure 3.
Figure 3.

Development of heifer weight throughout the experiment according to the feed management applied in the lactation (0–6 mo) and rearing (6–15 mo) periods. LO = 0.7 kg/d target ADG; HI = 1.0 kg/d target ADG.a a–dMeans at a given age with different superscripts differ significantly (P < 0. 05).

 


Figure 4.
Figure 4.

Estimated energy and protein intake by heifers with different nutrition treatments during the lactation (0–6 mo) and rearing (6–15 mo) periods. LO = 0.7 kg/d target ADG; HI = 1.0 kg/d target ADG.

 


Figure 5.
Figure 5.

Plasma concentrations of glucose, NEFA, cholesterol, β-hydroxybutyrate and urea in beef heifers with different nutrition treatments in the lactation (0–6 mo) and rearing (6–15 mo) periods. LO = 0.7 kg/d target ADG; HI = 1.0 kg/d target ADG. a–cMeans at a given age with different superscripts differ significantly (P < 0. 05).

 


Figure 6.
Figure 6.

Plasma concentrations of IGF-I and leptin in beef heifers with different nutrition treatments in the lactation (0–6 mo) and rearing (6–15 mo) periods. LO = 0.7 kg/d target ADG; HI = 1.0 kg/d target ADG. a,bMeans at a given age with different superscripts differ significantly (P < 0. 05).