荷斯坦牛头胎患隐性乳房炎次数和乳中体细胞评分对2胎体细胞评分的影响

doi:10.3864/j.issn.0578-1752.2022.20.015

Abstract

Abstract:

【Objective】There was correlation between physiological status of different parities of cows. The objective of this research was to explore the effect of the number of subclinical mastitis (SCM) and somatic cell score (SCS) in milk of parity 1 on SCS of Holstein cows for parity 2. 【Method】This study collected 162 509 DHI records of Holstein cows with parity 1 and 2 from 2015 to 2020 in 13 farms in Jiangsu Province. Excel 2019 was used to pre-process and filter DHI records firstly. The mixed model of SAS (Ver 9.4) was used to explore the effects of farm size, sampling year, calving season, lactation month, the number of SCM on parity 1 and each average lactation stage of SCS on parity 1 on SCS of parity 2. At the same, the correlation coefficients between the number of SCM and the SCS for each lactation stage of parity 1 with SCS in each lactation month for parity 2 of Holstein cows were calculated.【Result】The farm size, sampling year, calving season, lactation month, the number of SCM on parity 1 and average SCS on parity 1 in different periods had extremely significant effects on the SCS of parity 2 (P<0.01). Among them, SCS with farm size over 5 000 was lower than other farm size (P<0.05). SCS in 2020 was higher than other sampling year (P<0.05). SCS of cows calving in summer and spring was higher than other calving season (P<0.05), while SCS of cows calving in winter was lower than other calving season (P<0.05). SCS in the 9th and 10th lactation month was higher than other lactation months (P<0.05), while SCS in the second lactation month was lower than other lactation months (P<0.05). The SCS in each lactation month of parity 2 showed downward firstly and then upward trend for the cows with the number of SCM less than 2 for parity 1. The SCS for parity 2 in each lactation month fluctuated greatly for the cow with the number of SCM with 3 or more than in parity 1. When the average lactation of SCS, early lactation of SCS, mid lactation of SCS, and late lactation of SCS for the cows in parity 1 were 0, 1, 2, and 3, respectively, the SCS for each lactation month in parity 2 showed downward firstly and then upward trend. When the average lactation of SCS for the cow in parity 1 was more than 3, the SCS in parity 2 in each lactation fluctuated greatly. Overall, the number of SCM and the SCS for each lactation stage of cows in parity 1 increased, and the SCS in each lactation month for parity 2 gradually also increased. There was an extremely significant positive correlation between the number of SCM on parity 1 and SCS on parity 2 in each lactation month (P<0.01). The correlation coefficient of average SCS in the lactation for parity 1 with the SCS in parity 2 lactation month was the maximum (0.238). The correlation coefficient of average SCS in the early lactation for parity 1 and the SCS in parity 2 in each lactation month was the minimum (0.104). Among them, the correlation coefficient of the number of SCM for parity 1 with the SCS for parity 2 in the 3rd lactation month was the maximum. The correlation coefficient of the number of SCM for parity 1 with the SCS for parity 2 in the 10th lactation month was the minimum. The correlation coefficient of average SCS in the lactation for parity 1 with the SCS for parity 2 in the 5th lactation month was the maximum. The correlation coefficient of average SCS in the lactation for parity 1 with the SCS for parity 2 in the 5th lactation month was the minimum. The correlation coefficient of early lactation of SCS for parity 1 with the SCS for parity 2 in the 5th lactation month was the maximum, however, the SCS for parity 2 in the 1st and 10th lactation month was the minimum. The correlation coefficient of mid-lactation of SCS for parity 1 with the SCS for parity 2 in the 5th lactation month was the maximum, while the SCS for parity 2 in the 1st lactation month was the minimum. The correlation coefficient of late lactation of SCS for parity 1 with the SCS for parity 2 in the 5th lactation month was the maximum, while the SCS for parity 2 in the 1st lactation month was the minimum. 【Conclusion】The number of SCM and each average lactation stage of SCS for parity 1 had extremely significant effects on SCS in lactation for the cows of parity 2. There was an extremely significant positive correlation between the numbers of SCM for parity 1 with the SCS for parity 2 in each lactation month. The results provided references for improving quality of raw milk of Holstein cows in parity 2 in the future.

Key words: subclinical mastitis (SCM), somatic cell score (SCS), Holstein cows, parity

XIA YuXin,LIANG Yan,WANG HaiYang,GUO MengLing,ZHOU Bu,DAI Xu,YANG ZhangPing,MAO YongJiang. Effects of the Number of Subclinical Mastitis and Somatic Cell Score in Milk of Parity 1 on Somatic Cell Score of Holstein Cows for Parity 2[J].Scientia Agricultura Sinica, 2022, 55(20): 4052-4064.

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Figures/Tables 8

Table 1

Effects of different factors on SCS of Holstein cows for 2nd parity"

因素 Factor	水平 Level	样本量 Sampling number	SCS
牛场规模 Farm size	<1000	3324	2.94±0.03b
	1000-2000	11196	2.88±0.02c
	2001-5000	5477	3.36±0.03a
	>5000	42272	2.24±0.01d
	F值F value	901.016^**
	P值P value	0.000
采样年度 Sampling year	2011	6127	1.68±0.02g
	2012	25010	2.00±0.01ce
	2013	3524	2.13±0.03de
	2014	789	1.90±0.07g
	2015	6384	2.18±0.02ce
	2016	10854	2.00±0.02f
	2017	8200	2.24±0.02d
	2018	38306	2.32±0.01c
	2019	22702	2.67±0.01b
	2020	32283	2.84±0.01a
	F值F value	122.972^**
	P值P value	0.000
产犊季节 Calving season	春 Spring	15318	2.50±0.02a
	夏 Summer	21568	2.69±0.01a
	秋 Autumn	80915	2.31±0.01b
	冬 Winter	36711	2.20±0.01c
	F值F value	126.494^**
	P值P value	0.000
泌乳月 Lactation month	1	14516	2.33±0.02d
	2	18459	1.94±0.01g
	3	18339	2.03±0.01f
	4	17032	2.13±0.01f
	5	15153	2.20±0.01e
	6	14310	2.32±0.01d
	7	13561	2.43±0.01c
	8	12602	2.56±0.02b
	9	12408	2.72±0.01a
	10	9340	2.86±0.02a
	F值F value	139.351^**
	P值P value	0.000
头胎患SCM次数 The number of SCM on parity 1	0	122761	2.26±0.01e
	1	22790	2.59±0.01d
	2	5231	2.97±0.03c
	≥3	1840	3.13±0.05a
	F值F value	6.538^**
	P值P value	0.000
头胎泌乳期平均SCS Average SCS in the lactation for parity 1	0	2271	1.68±0.03f
	1	43190	1.96±0.01f
	2	55872	2.30±0.01e
	3	35725	2.66±0.01d
	4	13138	2.97±0.02cd
	5	3302	3.08±0.04c
	≥6	722	3.84±0.08a
	F值F value	9.273^**
	P值P value	0.000
头胎泌乳前期SCS Early lactation of SCS on parity 1	0	5348	2.06±0.02e
	1	29666	2.13±0.01e
	2	38541	2.31±0.01de
	3	25082	2.52±0.01cd
	4	11897	2.73±0.02bc
	5	4114	2.80±0.03bc
	≥6	1689	2.95±0.05ab
	F值F value	4.310^**
	P值P value	0.000
头胎泌乳中期SCS Mid lactation of SCS on parity 1	0	8154	1.91±0.02d
	1	43524	2.04±0.01cd
	2	45598	2.32±0.01c
	3	27959	2.59±0.01b
	4	12496	2.84±0.02b
	5	4573	2.95±0.03b
	≥6	1320	3.31±0.06a
	F值F value	19.317^**
	P值P value	0.000
头胎泌乳后期SCS Late lactation of SCS on parity 1	0	6400	1.86±0.02e
	1	40613	1.98±0.01e
	2	43751	2.28±0.01d
	3	32715	2.52±0.01d
	4	16765	2.82±0.02c
	5	6379	3.05±0.02bc
	≥6	1943	3.19±0.05a
	F值F value	39.591^**
	P值P value	0.000
头胎患SCM次数×2胎泌乳月 The number of SCM on parity 1×lactation month for parity 2		F值F value	1.100
		P值P value	0.278
头胎泌乳期平均SCS×2胎泌乳月 Average lactation of SCS on parity 1×lact-ation month for parity 2		F值F value	2.343^**
		P值P value	0.000
头胎泌乳前期SCS×2胎泌乳月 Early lactation of SCS on parity 1×lactation month for parity 2		F值F value	0.988
		P值P value	0.512
头胎泌乳中期SCS×2胎泌乳月 Midterm lactation of SCS on parity 1×lact-ation month for parity 2		F值F value	2.516^**
		P值P value	0.000
头胎泌乳后期SCS×2胎泌乳月 Late lactation of SCS on parity 1×lactation month for parity 2		F值F value	7.643^**
		P值P value	0.000

Table 1

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Fig. 4

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Fig. 7

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Effects of the Number of Subclinical Mastitis and Somatic Cell Score in Milk of Parity 1 on Somatic Cell Score of Holstein Cows for Parity 2

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