Table 3.

Data structure of dairy goats during the first 120 d of the first lactation.

Data structure	GF${}^{\mathrm{a}}$ ($n$ $=$ 7728)		GW${}^{\mathrm{a}}$ ($n$ $=$ 1464)
	$\stackrel{\mathrm{‾}}{X}$	SD	$\stackrel{\mathrm{‾}}{X}$	SD
Milk yield (kg)	281.49	109.06	299.25	107.05
First kidding age (in days)	517.59	210.29	608.95	265.05
No. of kids during first lactation${}^{\mathrm{b}}$	1.72	0.62	1.67	0.59
Proportion of extended lactation during first lactation (%)${}^{\mathrm{c}}$	18.0	39.0	19.0	40.0

${}^{\mathrm{a}}$ GF and GW denote the German Fawn and German White breeds respectively. ${}^{\mathrm{b}}$ Reduced number of data available: $n$ $=$ 7532 (GF) and $n$ $=$ 1375 (GW). ${}^{\mathrm{c}}$ Days of extended lactation over an animal's lifetime were calculated pro rata with respect to the total lactation days, and the proportions were grouped into four extended lactation (EL) classes: EL $=$ 0 %, $E$ $\le$ 50 %, EL $<$ 100 %, and EL $=$ 100 %