Use of Spline function for the characterisation on peak yield, peak day and persistency in lactation curves in Murciano-Granadina goats

Figures & data

Table 1. Data coding by levels.

	Levels
Variation factor	1	2	3	4	5
Region	Granada	Almeria	Cordoba
Type of kidding	Single	Twin	Triplet and upper
Lactation number	First	Second	Third	Fourth	Fifth and upper
Season	Winter	Spring	Summer	Fall
Lactation code	Codification by lactation of the animal

Figure 1. Biomodeling of the lactation curve in Murciano-Granadina goats and their persistency. PY: peak yield; IP: initial persistency; FP: final persistency; TP: total persistency.

Figure 2. Biomodeling of the lactation curve in Murciano-Granadina goats: PY: peak yield; IP: initial persistency; FP: final persistency; TP: total persistency according to variation factors: (a) dairy control nuclei of Almeria, Cordoba and Granada; (b) type of kidding (single, twin, triplet and upper), (c) lactation number (first, second, third, fifth and upper); and (d) season (spring, summer, fall and winter); all adjusted by Spline.

Table 2. Biomodeling of the lactation curve in Murciano-Granadina goat for knot, productions and persistency fitted by Spline function including full data set and to each level of the factors analysed.

Factor	Knot	Productions			Persistency
	X	PD	PY	TY	IP	FP	TP
Full data	75.250 ± 0.310	50	2.391	435.810	10.700	9.950	10.280
Region
Granada	79.340 ± 0.210^ab	49^a	2.277^a	416.770^c	10.720^a	9.950^b	10.290^b
Almeria	83.070 ± 0.290^a	47^a	2.539^a	469.790^a	10.770^a	10.160^a	10.420^a
Cordoba	73.680 ± 0.290^b	52^a	2.462^a	442.310^b	10.710^a	9.950^b	10.270^b
Type of kidding
Single	76.820 ± 0.250^b	54^a	2.166^a	398.580^b	10.800^a	10.120^a	10.420^a
Twin	71.220 ± 0.220^c	46^b	2.559^a	462.330^a	10.660^b	9.890^b	10.220^b
Triplet and upper	85.120 ± 0.350^a	53^a	2.393^a	438.060^a	10.760^a	10.050^a	10.360^a
Lactation number
First	87.640 ± 0.270^a	63^a	1.984^b	369.530^b	10.950^a	10.350^a	10.630^a
Second	67.660 ± 0.290^c	48^b	2.470^a	451.500^a	10.740^b	10.030^b	10.350^b
Third	71.850 ± 0.350^b	47^b	2.624^a	473.990^a	10.690^b	9.880^c	10.220^c
Fourth	75.470 ± 0.430^b	43^b	2.651^a	475.600^a	10.570^c	9.740^d	10.070^d
Fifth and upper	77.960 ± 0.380^b	42^b	2.559^a	453.170^a	10.430^d	9.560^e	9.920^e
Season
Winter	109.390 ± 0.260^b	63^a	2.293^a	422.390^c	10.670^b	9.890^b	10.24^b
Spring	130.190 ± 0.440^a	56^a	2.592^a	466.850^a	10.560^c	9.340^c	9.91^c
Summer	57.840 ± 0.340^c	40^b	2.569^a	443.690^b	10.580^bc	9.900^b	10.15^b
Fall	58.350 ± 0.230^c	45^b	2.303^a	432.040^c	10.940^a	10.430^a	10.65^a

Knot estimation ± typical errors of the mean (X), PD: peak day, PY: peak yield, TY: total yield, IP: initial persistency, FP: final persistency; TP: total persistency; ^{a, b, c, d, e} for a given factor, parameter estimates not sharing a common superscript are different (p < .05).