不同饲料效率与绵羊瘤胃组织形态学关系

doi:10.3864/j.issn.0578-1752.2020.24.014

Abstract

Abstract:

【Objective】The individual pens was used to determine individual feed efficiency-related traits and rumen morphology indexes, and the association of feed efficiency of sheep and rumen histomorphology was discussed, so as to provide fundamental data for analyzing the influencing factors of sheep feed efficiency traits. 【Method】One hundred and eighty-seven Hu lambs with the similar birthday age, good growth and available pedigrees were selected randomly, and all lambs were transferred to the housed indoors in individual pens after weaning at 56 days, the lambs were subjected to a 14 days adaptation period. The pre-test period was 10 days and the experimental period was 100 days, during which all lambs were fed pellet feed and had free access to food and fresh drinking water. Lambs were weighed before feeding in the morning at 80 and 100 days, and feed intake (FI) were measured during 80-180 days. Average daily gain (ADG), metabolic body weight (MBW), feed conversion rate (FCR) and residual feed intake (RFI) were calculated and the descriptive statistics were carried out. The lambs were slaughtered at 180 days, and rumen abdominal sac tissue was collected, and stored in 4% formaldehyde solution for making tissue sections. The length, width and muscle thickness of the rumen papilla were observed. Finally, correlation analysis and variance analysis were carried out for the traits related to feed efficiency.【Result】The variation coefficients of feed efficiency-related traits were all greater than 10%, and the difference of the individuals with the largest and smallest residual feed intake was 0.57 kg per day. Phenotypic correlation analysis of feed efficiency-related traits showed that RFI was very significantly positively correlated with FCR (r= 0.68) and FI (r= 0.48) (P<0.01), there was no significant correlation with initial body weight (r=0) final body weight (r= -0.01) and average daily gain (r= -0.02) (P>0.05). The correlation analysis between feed efficiency and rumen histomorphology was found that the length of the rumen papilla was significantly or very significantly positively correlated with average daily gain, feed intake, initial body weight and final body weight (P<0.05 or P<0.01), while there were no significant differences in length and width of rumen papilla (P>0.05). The feed intake and feed conversion rate of lambs in the High-RFI group were significantly higher than those in the Low-RFI group (P<0.01), and the muscle thickness was significantly higher than that of the Medium-RFI group (P<0.05). There were significantly or extremely significantly differences in residual feed intake, feed intake, ADG, initial body weight, final body weight and the length of rumen in different FCR groups (P<0.05 or P<0.01), there was no significant difference between the rumen muscular thickness and the width of rumen papilla (P>0.05). Among them, the residual feed intake, feed intake, ADG, initial body weight and final body weight of the lambs in the High-FCR group were significantly or extremely significantly higher than those in the Low-FCR group (P<0.05 or P<0.01), The length of the rumen papilla in the medium-FCR group was significantly longer than that in the Low-FCR group (P<0.05). There were significant or extremely significant differences in the above indexes of the lambs in different FI groups (P<0.05 or P<0.01), and the residual feed intake, feed conversion rate, ADG, initial body weight, final body weight, muscle thickness and the length of the rumen papilla in the High-FI group were significantly or extremely significantly higher than those in the Low-FI group (P<0.05 or P<0.01). There were significant or extremely significant differences in feed intake, feed conversion rate, initial body weight, final body weight and muscle thickness in different ADG groups (P<0.05 or P<0.01), there was no significant difference between the length and the width of the rumen papilla (P>0.05), the feed intake, residual feed intake, initial body weight, final body weight and muscle thickness of the High-ADG group were significantly or extremely significantly higher than those of the Low-ADG group, and the feed conversion rate was significantly lower than that of the Low-ADG group.【Conclusion】There was a significant positive correlation between residual feed intake and the traits related to feed efficiency such as feed intake and feed conversion rate, indicating that it could be used as a potential index to measure feed efficiency. There was no significant correlation between the residual feed intake and feed conversion rate and the rumen histopathology. Feed intake and average daily gain were significantly positively correlated with the length of the rumen papilla and the muscular thickness, indicating that the morphology of the rumen tissue had significant effects on feed intake and body weight gain. However, the mechanism of action remains to be further studied.

Key words: residual feed intake, feed conversion rate, rumen, histomorphology, Hu sheep

ZHANG DeYin,ZHANG XiaoXue,LI FaDi,LI Chong,LI GuoZe,ZHANG YuKun,LI XiaoLong,SONG QiZhi,ZHAO Yuan,LIU XiaoQing,MA LiangQiang,WANG WeiMin. Association of Rumen Histomorphology of Sheep with Different Feed Efficiencies[J].Scientia Agricultura Sinica, 2020, 53(24): 5115-5124.

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性状 Trait	均值 Mean	标准差 SD	变异系数 CV（%）	最大值 Max	最小值 Min
剩余采食量RFI (kg·d^-1)	0.00	0.10	-	0.30	-0.27
采食量FI (kg)	155.40	20.84	13.41	203.70	100.80
平均日增重ADG (g·d^-1)	270.12	34.04	12.60	350.00	177.00
饲料转化率FCR	5.77	0.58	10.05	8.55	4.24
初始体重Initial BW (kg)	18.99	3.79	19.96	27.80	10.04
末期体重Final BW (kg)	46.00	6.01	13.07	61.90	29.10

组别 Groups	个数 Numbers	采食量 FI (kg)	平均日增重 ADG (g·d^-1)	饲料转化率 FCR	初始体重 Initial BW （kg）	末期体重 Final BW (kg)	肌层厚度 Muscular thickness (μm)	乳头长度 Papilla height (μm)	乳头宽度 Papilla width (μm)
High-RFI	56	168.63±15.73A	272.93±32.71	6.22±0.55A	19.16±3.01	46.45±4.73	766.87±163.98a	1138.59±396.27	245.83±33.41
Medium-RFI	71	153.48±19.03B	267.96±34.55	5.75±0.43B	18.61±4.02	45.41±6.33	687.90±186.95b	1096.72±461.15	245.72±44.83
Low-RFI	60	145.31±20.85C	270.07±35.01	5.39±0.46C	19.28±4.16	46.28±6.68	719.26±189.87ab	1048.59±353.14	241.18±46.01

组别 Groups	个数 Numbers		剩余采食量 RFI (kg·d^-1)	饲料转化率 FCR	初始体重 Initial BW (kg)	末期体重 Final BW (kg)	肌层厚度 Muscular thickness (μm)	乳头长度 Papilla height (μm)	乳头宽度 Papilla width (μm)
High-ADG	59	170.48±14.64A	-0.006±0.11	5.55±0.44B	20.21±3.64A	50.96±4.18A	765.01±195.82a	1126.10±438.54	245.58±43.93
Medium-ADG	75	157.47±13.87B	-0.005±0.09	5.84±0.53A	19.74±3.42A	46.74±3.56B	713.63±187.71ab	1124.63±367.61	245.42±42.04
Low-ADG	53	135.68±19.49C	0.005±0.11	5.94±0.71A	16.58±3.38B	39.44±4.34C	684.60±153.68b	1014.27±427.28	241.28±40.32

组别 Groups	个数 Numbers	剩余采食量 RFI (kg·d^-1)	饲料转化率 FCR	平均日增重 ADG (g·d^-1)	初始体重 Initial BW (kg)	末期体重 Final BW (kg)	肌层厚度 Muscular thickness (μm)	乳头长度 Papilla height (μm)	乳头宽度 Papilla width (μm)
High-FI	59	0.049±0.10A	6.05±0.56A	295.79±26.80A	22.08±3.08A	51.66±3.63A	761.15±202.61a	1161.56±419.86A	239.28±33.94
Medium-FI	77	-0.004±0.09B	5.79±0.52B	271.10±23.52B	19.03±2.64B	46.14±3.16B	722.19±185.29ab	1155.08±414.32A	252.09±41.84
Low-FI	51	-0.061±0.08C	5.42±0.51C	238.98±29.47C	15.35±2.63C	39.25±4.39C	674.99±145.26b	922.96±340.51B	238.34±48.99

组别 Groups	个数 Numbers	剩余采食量 RFI (kg·d^-1)	采食量 FI (kg)	平均日增重 ADG (g·d^-1)	初始体重 Initial BW (kg)	末期体重 Final BW (kg)	肌层厚度 Muscular thickness (μm)	乳头长度 Papilla height (μm)	乳头宽度 Papilla width (μm)
High-FCR	53	0.078±0.09A	165.51±17.72A	256.58±28.56B	21.11±3.48A	46.77±5.42a	709.28±147.02	1094.28±402.16ab	248.13±41.56
Medium-FCR	75	0.003±0.07B	158.22±18.37B	274.16±33.76A	19.32±3.09B	46.73±5.79a	741.11±220.29	1181.26±450.19a	238.19±32.44
Low-FCR	59	-0.083±0.07C	142.72±20.33C	277.15±35.92A	16.66±3.63C	44.38±6.53b	707.90±160.05	982.25±332.19b	248.62±41.98

Association of Rumen Histomorphology of Sheep with Different Feed Efficiencies

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