Gir and Guzerat cow milk production and composition according to lactation stage, somatic cell count, physiological state and body condition

Araújo, Thalita Polyana Monteiro; Rangel, Adriano Henrique do Nascimento; Lima, Guilherme Ferreira da Costa; Peixoto, Maria Gabriela Campolina Diniz; Urbano, Stela Antas; Bezerra, Joadilza da Silva

doi:10.4025/actascianimsci.v40i1.39352

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Acta Scientiarum. Animal Sciences

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ANIMAL PRODUCTION • Acta Sci., Anim. Sci. 40 • 2018 • https://doi.org/10.4025/actascianimsci.v40i1.39352 copy

Gir and Guzerat cow milk production and composition according to lactation stage, somatic cell count, physiological state and body condition

Produção e composição do leite de vacas Gir e Guzerá de acordo com o estádio de lactação, contagem de células somáticas, estado fisiológico e de condição corporal

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT.

This work was realized to evaluate lactation stage, physiological state, somatic cell count (SCC) and body condition score (BCS) on production and composition of cow's milk from Gir and Guzerat breeds were studied. Ninety-eight cows were analyzed and classified according to their physiological state, lactation stage, SCC and BCS. Milk production was weighed monthly to obtain production data. Composed samples were collected in vials containing preservatives and sent to the laboratory for analysis. Data were used for statistic descriptive analysis and analysis of variance. Higher milk production in the first 60 days of lactation was observed. Fat, protein and total solids concentration increased according to the increase of days in milk; while lactose concentration decreased. Higher levels of fat, protein and total solids in milk of non-pregnant cows were observed; while pregnant cows had higher daily production and higher lactose content in their milk. Higher lactose levels in milk were observed in animals with lower SCC. The BCS had no effect on milk composition or on somatic cell count. Zebu cow milk production and composition are influenced by lactation stage, physiological state and SCC.

Keywords:
gestation; milk quality; body reserve; zebu

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[1] *Author for correspondence. E-mail: stela_antas@yahoo.com.br

Variables	LSM ± SD	MIN	MAX	LSM ± SD	MIN	MAX
Variables	Gir			Guzerat
Fat, %	4.12±0.99^a	1.79	7.20	4.22±1.00^a	1.29	6.87
Protein, %	3.26±0.30^a	2.71	4.24	3.40±0.34^b	2.62	4.30
Lactose, %	4.63±0.20^a	4.15	5.03	4.62±0.25^a	4.04	5.11
Total solids, %	12.93±1.05^a	10.61	16.30	13.22±1.19^b	10.50	16.09
Milk production, kg day^-1	11.30±5.25^a	0.50	30.30	11.25±5.01^a	2.00	27.00

Categories	MP	Fat, %	Protein, %	Lactose, %	TS, %
I	13.34^a	3.72^a	3.52^a	4.71^a	13.51^a
II	12.01^b	4.12^b	3.49^b	4.69^b	13.74^b
III	8.71^c	4.78^c	3.66^c	4.54^c	14.54^c

Variables	Means ± SD	Minimum	Maximum
Non-pregnant lactating cows
Fat, %	4.47±0.94ª	2.61	6.87
Protein, %	3.83±0.30ª	3.03	4.24
Lactose, %	4.56±0.22ª	4.11	4.87
Total solids, %	13.80±0.97ª	12.33	16.30
Milk production, kg day^-1	9.92±3.43ª	4.00	17.20
Pregnant lactating cows
Fat (%)	4.13±0.98^b	1.29	7.20
Protein (%)	3.33±0.33^b	2.62	4.30
Lactose (%)	4.63±0.23^b	4.04	5.11
Total solids (%)	13.04±1.14^b	10.50	16.09
Milk production, kg day^-1	11.42±5.26^b	0.50	30.30

Variable	Mean + SD	Minimum	Maximum
	SCC 1
Fat, %	4.07 ± 0.83^a	1.79	5.59
Protein, %	3.31 ± 0.38ª	2.62	4.00
Lactose, %	4.71 ± 0.21ª	4.05	5.13
Total solids, %	13.15 ± 1.07ª	10.97	15.60
Milk production, kg day^-1	12. 06 ± 1.78ª	1.00	22.00
	SCC 2
Fat, %	4.23 ± 1.05ª	1.29	5.20
Protein, %	3.35 ± 0.32ª	2.67	4.30
Lactose, %	4.60 ± 0.23^b	4.04	5.04
Total solids, %	13.13 ± 1.07ª	10.50	15.30
Milk production, kg day^-1	10.73 ± 4.96ª	1.70	30.00

Parameter	Body condiction score (BCS)
Parameter	2.0	2.5	3.0	3.5	4.0
Gir
Fat, %	3.95±1.08^a	3.79±1.04^a	4.60±1.26^a	4.01±1.10^a	4.03±1.11^a
Protein, %	3.35±0.34^a	3.19±0.32^a	3.34±0.33^a	3.31±0.33^a	2.99±0.30^a
Lactose, %	4.59±0.46^a	4.60±0.46^a	4.46±0.45^a	4.69±0.47^a	4.80±0.48^a
Total solids, %	12.77±1.33^a	12.47±1.30^a	13.33±1.39^a	12.95±1.35^a	12.80±1.34^a
DDE, %	8.89±0.51^a	8.70±0.50^a	8.63±0.49^a	8.92±0.51^a	8.77±0.50^a
SSC, log cel mL^-1	6.20±2.30^a	5.42±2.02^a	5.29±1.97^a	3.32±1.24^a	3.79±1.41^a
Guzerat
Fat, %	-	3.70±0.96^a	4.32±1.12^a	4.20±1.08^a	4.23±1.09^a
Protein, %	-	3.32±0.36^a	3.41±0.37^a	3.44±0.37^a	3.52±0.38^a
Lactose, %	-	4.70±0.37^a	4.57±0.36^a	4.60±0.36^a	4.38±0.35^a
Total solids, %	-	12.64±1.25^a	13.29±1.32^a	13.20±1.31^a	13.10±1.30^a
DDE, %	-	8.94±0.56^a	8.98±0.56^a	9.04±0.56^a	8.84±0.55^a
SSC, log cel mL ^-1	-	4.59±2.11^a	5.19±2.39^a	4.64±2.14^a	6.09±2.80^a