Genetic effects and correlations between production and fertility traits and their dependency on the lactation-stage in Holstein Friesians

Table 3 Genetic correlations between fertility and production traits

	MY₆₀	MY₃₀₅	FY₆₀	FY₃₀₅	PY₆₀	PY₃₀₅	FC₆₀	FC₃₀₅	PC₆₀	PC₃₀₅
RZR	−0.24***	−0.26 ***	−0.19 ***	−0.20 ***	−0.23 ***	−0.28 ***	0.003	0.07**	0.05†	0.02
CON	−0.14***	−0.17 ***	−0.11 ***	−0.11 ***	−0.16 ***	−0.20 ***	0.005	0.06*	−0.01	−0.02
FLh	−0.09 ***	−0.11 ***	−0.11 ***	−0.09 ***	−0.10 ***	−0.13 ***	−0.04	0.03	−0.003	−0.01
FLc	−0.24 ***	−0.27 ***	−0.20 ***	−0.22 ***	−0.22 ***	−0.29 ***	−0.01	0.06*	0.06*	0.03
NRh	−0.04†	−0.08**	−0.02	−0.02	−0.08**	−0.11***	0.02	0.05*	−0.05†	−0.03
NRc	−0.06*	−0.07**	−0.03	−0.03	−0.09***	−0.11***	0.03	0.04†	−0.04†	−0.05†
CFc	−0.32***	−0.33***	−0.26***	−0.27***	−0.24***	−0.31***	0.003	0.07**	0.17***	0.12***
DO	−0.33***	−0.36***	−0.27***	−0.29***	−0.27***	−0.35***	−0.004	0.08**	0.14***	0.09***

P-values *** < 0.0001 ** < 0.001 * < 0.01 † < 0.05.
MY: milk yield; FY: fat yield; PY: protein yield; FC: fat content; PC: protein content, RZR: fertility index, summarizing all following traits, FLc and FLh: 1^st to successful insemination separated after cows and heifers, NRc and NRh: non-return rate for cows and heifers, CON: conception (summarizing FLC and FLH, NRC and NRH), CFc: calving to first insemination; DO: and days open.
60 – averaged over first 60 lactation days; 305 – 305-day records.

ISSN: 2730-6844