scholarly journals Growth performance, nutrient digestibility and haematological indices of broiler chickens fed diets supplemented with riboflavin and pyridoxine

2020 ◽  
Vol 45 (1) ◽  
pp. 259-267
Author(s):  
A. V. Jegede ◽  
I. A. Ogunsola ◽  
A. O. Fafiolu ◽  
O. O. Oluwatosin ◽  
R. F. Lawal ◽  
...  
Keyword(s):  
Growth Performance ◽  
Broiler Chickens ◽  
Growth Parameters ◽  
Dietary Treatment ◽  
Basal Diet ◽  
Good Health ◽  
Nutrient Digestibility ◽  
Vitamin Supplementation ◽  
Protein Retention ◽  
Final Weight

A 56 days feeding experiment was conducted to investigate the growth performance, nutrient digestibility and blood characteristics of broiler chickens fed diets supplemented with riboflavin and pyridoxine. A total of two hundred and forty day old unsexed Marshall Broiler chickens were assigned to eight diets in a completely randomised design. The diets were such that diet 1 was the control (basal diet without vitamin supplementation), diets 2, 3 and 4 had basal diet supplemented with 4 mg/kg, 8 mg/kg and 12 mg/kg riboflavin, respectively, diets 5, 6, and 7 had basal diet supplemented with 3.5 mg/kg, 7 mg/kg and 10.5 mg/kg pyridoxine, respectively while diet 8 had basal diet with 4 mg/kg riboflavin + 3.5 mg/kg pyridoxine. Each dietary treatment was replicated three times with 10 birds per replicate. The growth parameters measured at day 28 were not significantly influenced (P>0.05) by the diets. At day 56, the final weight (1980 g) was highest in birds fed diets with 7 mg/kg supplemental pyridoxine, though the final weight value was similar (P>0.05) to those fed diets supplemented with 4 mg/kg (1793.30 g) and 12 mg/kg (1700.00 g) riboflavin. Higher protein retention values were recorded for broilers fed higher concentration of supplemental riboflavin and pyridoxine. The packed cell volume (PCV) and haemoglobin (Hb) concentration of broilers fed diets supplemented with 8 mg/kg riboflavin and 7 mg/kg pyridoxine (insert the values here) were higher than those on other diets. Higher levels of riboflavin and pyridoxine and their combination resulted in an elevated heterophil and decreased lymphocyte values. An elevated (P<0.05) mean corpuscular haemoglobin (MCH) (44.75 pg/cell) and mean corpuscular volume (MCV) (133.05 f/L) concentration was observed in broilers fed diets containing added 3.5 mg/kg pyridoxine. The study revealed that 8 mg/kg riboflavin and 7 mg/kg pyridoxine is required for improved final weight, crude protein retention and good health of broiler chickens.  

scholarly journals Effects of different emulsifiers on growth performance, nutrient digestibility, and digestive enzyme activity in weanling pigs1

2019 ◽  
Vol 97 (10) ◽  
pp. 4235-4241
Author(s):  
Guangdong Bai ◽  
Wei He ◽  
Zheng Yang ◽  
Huiyang Fu ◽  
Shengnan Qiu ◽  
...  
Keyword(s):  
Growth Performance ◽  
Mrna Expression ◽  
Digestive Enzyme ◽  
Low Density Lipoprotein ◽  
Plasma Lipid ◽  
Density Lipoprotein ◽  
Dietary Treatment ◽  
Basal Diet ◽  
Nutrient Digestibility ◽  
Treatment Groups

Abstract The objective of this study was to investigate the effects of diets supplemented with sodium stearoyl-2-lactylate (SSL), polyglycerol fatty acid ester (PGFE), and combined emulsifiers (0.02% SSL and 0.08% PGFE) on growth performance, nutrient digestibility, and plasma lipid profiles in weaned piglets and to further evaluate the possible effects of feeding exogenous emulsifiers on digestive enzyme activities and liver bile acid (BA) metabolism. Twenty-eight barrows (age at 35 d, Duroc × Landrace × Yorkshire) with an initial BW of 10.13 ± 0.16 kg were randomly assigned to 4 dietary treatment groups (7 pigs/treatment). Dietary treatment groups included the following: 1) basal diet (Control, CTR); 2) basal diet with 0.1% SSL (SSL); 3) basal diet with 0.1% PGFE (PGFE); and 4) basal diet with 0.08% PGFE+0.02% SSL (PG-SL). SSL diet increased ADG and ADFI of piglets during day 0 to 17 (P < 0.05) compared with the CTR treatment. Piglets fed emulsifier diets experienced a significant improvement in the digestibility of nutrients (DM, CP, ether extract, energy, calcium, and phosphorus) during the first 17 d (P < 0.05). The level of low-density lipoprotein cholesterol (LDL-C) was lower in the PGFE and PG-SL treatment groups than in the CTR treatment group (P < 0.05). Feeding emulsifier diets increased the lipase activity of the pancreas when compared with the CTR diet (P < 0.05). Moreover, the emulsifier diets significantly increased the mRNA expression of FXR (P < 0.05) and decreased the mRNA expression of CYP27A1 (P < 0.05) in the liver. In conclusion, the addition of emulsifiers improved nutrient digestibility and increased the mRNA expression of FXR BA receptors while inhibiting the mRNA expression of BA biosynthesis by CYP27A1 in weanling piglets.

scholarly journals Growth performance and nutrient digestibility of broiler chickens fed diets substituted for maize with two varieties of cassava tuber

2020 ◽  
Vol 46 (2) ◽  
pp. 128-136
Author(s):  
A. O. Obadimu ◽  
O. O. Oluwatosin ◽  
I. O. Sanni ◽  
A. O. Lala
Keyword(s):  
Weight Gain ◽  
Growth Performance ◽  
Broiler Chickens ◽  
Control Diet ◽  
Nutrient Utilization ◽  
Nutrient Digestibility ◽  
Conversion Ratio ◽  
Feed Conversion Ratio ◽  
Feed Conversion ◽  
Final Weight

A 56 –day study was conducted to determine the growth performance and nutrient utilization of broiler chickens fed with two varieties (white and yellow) of cassava grit based diets. A total of 240 one day- old unsexed Arbor acre broiler chicks were assigned to eighty dietary treatments in a 2 x 4 factorial arrangement using completely randomized design. Diets were formulated to include two varieties of cassava, TME 419 (white) and TMS 01 1368 (yellow) at four inclusion levels (0, 25, 50 and 75%). Each treatment consisted of 30 birds and three replicates of 10 birds each. Data was collected on growth performance and nutrient digestibility at the end of the starter (4th week) and finisher (8th week) phases. At the starter phase, birds fed 50% white cassava grits diet had the highest (P < 0.05) final weight and weight gain (730.00 and 693.67g/bird). At the finisher phase, birds fed 50% yellow cassava grits diet had the highest (P < 0.05) final weight and weight gain (2235.60 and 1454.00g/bird), respectively while the least final weight and weight gain values (2008.80 and 1267.80g/birds) were obtained in birds fed the control diet. At the starter phase, birds fed 75% white cassava grits diet had the best (P < 0.05) feed conversion ratio of 2.18, while birds fed 25% yellow cassava grits diet as well as those fed the control diet had the least (P < 0.05) feed conversion ratio of 2.62 and 2.51 respectively. Birds fed 50% yellow as well as those fed 75% yellow cassava grits diets had the highest dry matter and crude fibre digestibility at the starter and finisher phases, respectively. In conclusion the substitution of maize with white cassava grits up to 50% level improved growth performance at the starter phase. However, either white or yellow cassava can be substituted for maize up to 75 % at the finishing phase.

Effect of the bacterial or fungal origin of exogenous xylanases supplemented to a wheat-based diet on performance of broiler chickens and nutrient digestibility of the diet

2010 ◽  
Vol 90 (2) ◽  
pp. 221-228 ◽  
Author(s):  
S. Vandeplas ◽  
R D Dauphin ◽  
P. Thonart ◽  
A. Théwis ◽  
Y. Beckers
Keyword(s):  
Growth Performance ◽  
Broiler Chickens ◽  
Trichoderma Viride ◽  
Basal Diet ◽  
Nutrient Digestibility ◽  
Metabolizable Energy ◽  
Daily Weight Gain ◽  
Crude Fibre ◽  
Final Body Weight ◽  
Significant Difference

Two identical experiments were carried out to study the effects of four xylanases from bacterial or fungal origin supplemented to a wheat-based diet, on growth performance of broiler chickens and nutrient digestibilities. Experimental treatments consisted of a control basal diet containing 600 g kg-1 wheat (C), and the basal diet supplemented with 0.1 g kg-1 Grindazyme G from Aspergillus niger (G), 0.1 g kg-1 Belfeed B1100MP from Bacillus subtilis (B), 0.1 g kg-1 Roxazyme G from Trichoderma viride (R), or 0.0125 g kg-1 of a xylanase from Aspergillus aculeatus (A). Each experimental diet was given to four groups of six chickens each. Growth performance and feed conversion ratio (FCR) were recorded weekly, from 7 to 21 d of age. In the second experiment, a digestion balance trial was performed from 27 to 31 d of age to evaluate the nitrogen-corrected apparent metabolizable energy (AMEn) and the digestibilities of nitrogen, crude fat, starch and crude fibre. From 7 to 21 d of age, xylanase supplementation led to increased final body weight and daily weight gain, by 3.7 and 4.5 % (P < 0.05), respectively, without significant difference according to the xylanase origin. Xylanase supplementation significantly increased the AMEn (+2.6 %), and the digestibilities of crude fibre (+58.9 %) and nitrogen (+1.6 %). Increase in AMEn as well as in crude fat and starch digestibilities were significantly different according to the xylanase, but were not dependent on fungal or bacterial origin. In conclusion, the microbial origin of xylanases supplemented to wheat-based diets influenced neither the performance of broiler chickens nor the improvement in nutrient digestibilities.Key words: Broiler, growth performance, nutrient digestibility, wheat, xylanase

scholarly journals Growth Performance, Nutrient Digestibility, Biochemical Properties, Hematological Traits, and Intestinal Histopathology of Broiler Chicks Fed Mannan Oligosaccharides

2021 ◽  
Vol 11 (4) ◽  
pp. 621-633
Author(s):  
Abdallah Ali Ghazalah ◽  
Mohamed Ahmed Fouad El-Manylawi ◽  
Hady Fathy Abbas Motawe ◽  
Marwa Salah Khattab ◽  
Yara Ibrahem Youssef
Keyword(s):  
Growth Performance ◽  
Broiler Chickens ◽  
Density Lipoprotein ◽  
Basal Diet ◽  
Blood Parameters ◽  
Nutrient Digestibility ◽  
The Other ◽  
Control Group ◽  
Broiler Chicks ◽  
Treatment Groups

, , , , and Antibiotics as growth promoters in poultry diets are currently restricted, so other feed additives, such as prebiotics and probiotics, have been suggested as an antibiotics alternative to improve the performance and gut health of poultry. The current experiment was conducted to study the effects of adding Mannan oligosaccharides (MOS) as a potential replacement for an antibiotic on productive performance, nutrient digestibility, some blood parameters, and caecal microbiota of broiler chickens. For conducting the current research experiment, a total of 180 one–day old Ross broiler chicks were randomly divided into one control group fed a basal diet and four dietary treatments with six replicates for each treatment. The treatment groups were fed a basal diet supplemented with different levels of MOS 0.5, 1, and 2 g/Kg diet and Lincomycin 4.4 mg/Kg diet during 35 days of the feeding trial. With exception of the growing period, the group fed a basal diet supplemented with 2 g MOS/Kg feed had considerably higher body weight and weight gain, while having the lowest feed consumption and best feed conversion ratio compared to the other treatment groups, during all experimental periods. Moreover, dietary supplementation of MOS resulted in a significant decrease in the counts of caecal E. coli and Enterococcus, while Lactobacillus and Yeast bacteria counts were significantly higher, compared to non-supplemented groups. Broiler chicks having a 2 g MOS/kg diet recorded lower values of cholesterol, low-density lipoprotein (LDL), urea, and liver enzymes, including Aspartate transaminase (AST) and Alanine aminotransferase (ALT), while they recorded significantly higher high-density lipoprotein (HDL), compared to the other experimental groups. Group treated with MOS 2 g/Kg feed improved digestibility of crude protein, ether extract, crude fiber, nitrogen-free extract, and organic matter, compared to the control group, Additionally, MOS supplementation also increased the intestinal villi length, width, and crypt depth and decreased intestinal inflammation, compared to the control group. In conclusion, supplementation of MOS at 2 g/kg diet improved growth performance, digestibility, and blood parameters without having adverse effects on the intestine of broiler chickens, comparable to the Lincomycin.

scholarly journals Evaluation of maize-yam peel meal based diets supplemented with exogenous cocktail enzymes on growth performance, nutrient digestibility and metabolisable energy in finisher broiler chickens.

2020 ◽  
Vol 45 (4) ◽  
pp. 125-134
Author(s):  
M. A. Oguntoye ◽  
T. Samuel ◽  
I. Usman ◽  
A. Ahmed ◽  
Y. Maikano
Keyword(s):  
Weight Gain ◽  
Growth Performance ◽  
Broiler Chickens ◽  
Dry Matter ◽  
Nutrient Digestibility ◽  
Total Weight ◽  
Daily Weight Gain ◽  
Dry Matter Digestibility ◽  
Final Weight ◽  
Enzyme Supplementation

This study was conducted to investigate the effect of maize and yam peels meal based diets with and without enzyme supplementation on the growth performance and nutrient digestibility of broiler chickens at finisher phase. One hundred and eighty (180), one day-old broiler chicks were fed six diets in two groups. The experiment was arranged in a 2 × 3 factorial experimental layout of two levels of enzyme (0g/100kg diet and 50g/100kg diet) and three levels of yam peels inclusion (0kg, 15kg and 30kg). Each treatment was replicated 3 times consisting of 10 chicks per replicate. The experiment lasted 4 weeks. Main effect of graded levels of yam peel meal and enzymes supplementation on growth performance of starter broiler chickens showed significant (P ? 0.05) influence on final weight, total weight, total weight grain and daily weight grain. Birds fed 0% YPM recorded higher statistical value of 2549.00g for final weight. Interaction effect of YPM and enzyme showed significant (<0.05) effect on growth performance of finisher broiler chickens. Final weight, total weight gain and daily weight gain were significantly (<0.05) influenced by interaction of YPM and enzyme. Birds fed control diet (T1 ) recorded higher significant (P<0.05) values for final weight of comparative level. Least value of 2220.00g was recorded for final weight in the birds fed 15% YPM without enzyme (T2 ). Varying levels of YPM as a partial replacement for maize had no significant (P>0.05) effect on nutrient digestibility. Higher values were recorded for birds fed 0% inclusion level of YPM across the parameter determined with the exception of ether extract and ash. Inclusion of YPM with enzyme supplementation had significant (P<0.05) interaction effects on percentage dry matter digestibility, crude protein digestibility and crude fibre digestibility. Dry matter digestibility decreased with increased level of YPM with or without enzyme. Inclusion of yam peels meal up to 30% level of replacement for maize with or without enzyme supplementation could be recommended for appreciable nutrient digestibility and improved growth performance of finisher broiler chickens.

EFFECTS OF TURMERIC RESIDUE ON HEMATOLOGICAL PARAMETERS, NUTRIENT DIGESTIBILITY AND GROWTH PERFORMANCE OF HYBRID CATFISH (Clarias gariepinus × Heterobranchus bidorsalis)

2020 ◽  
Vol 65 (10) ◽  
pp. 134-142
Author(s):  
Hung Nguyen Phuc ◽  
Nguyen Do Thi ◽  
Phuong Nguyen Mai
Keyword(s):  
Body Weight ◽  
Growth Performance ◽  
Hematological Parameters ◽  
Clarias Gariepinus ◽  
Dietary Treatment ◽  
Basal Diet ◽  
Nutrient Digestibility ◽  
Final Body Weight ◽  
Positive Effects ◽  
Hybrid Catfish

Turmeric residue (TR), which is obtained from the extraction process of curcuminoids, may remain biological active compounds. This study was conducted to examine the effects of the TR on hematological parameters, nutrient digestibility, and growth performance in hybrid catfish (Clarias gariepinus × Heterobranchus bidorsalis). Three experimental diets were formulated denoted as follows: BD (Basal diet), BTR1D (BD plus 1% TR powder), and BTR2D (BD plus 2% TR powder). Twelve juvenile hybrid catfish with an initial body weight of 180 g were allocated to each of the 6 concrete tanks (350-L holding capacity), resulting in two replicate tanks per dietary treatment. For 4 weeks, the fish were hand-fed the experimental diets to apparent satiation twice daily. The results showed that the final body weight and weight gain tended to increase in fish fed TR-supplemented diets, and significant differences were recorded in the BTR2D group as compared to the BD group (P < 0.05). In contrast, FCR values were decreased in fish fed BTR1D and BTR2D in comparison with those fed BD, and the FCR value of the BTR2D group was significantly lower than that of the BD group (P < 0.05). Hemoglobin concentration, white blood cell count and protein and lipid apparent digestibility coefficients were higher in fish fed TR-supplemented diets than those fed BD. These results indicated that dietary supplementation of the TR was beneficial to hematological parameters, nutrient digestibility, growth performance, and feed utilization in hybrid catfish. The positive effects of the BTR2D on fish performances in the present study suggest that supplementation of the TR at the ratio of 2% in the diet may be necessary for hybrid catfish practical culture.

scholarly journals The effects of instant noodles waste in diets for broiler chickens

2021 ◽  
Vol 38 (2) ◽  
pp. 97-106
Author(s):  
A. O. Lala ◽  
A. O. Oso ◽  
A. O. Fafiolu ◽  
A. M. Bamigbose ◽  
D. Eruvbetine ◽  
...  
Keyword(s):  
Growth Performance ◽  
Broiler Chickens ◽  
Control Diet ◽  
Live Weight ◽  
Dietary Treatment ◽  
Nutrient Digestibility ◽  
Broiler Chicks ◽  
Blood Profile ◽  
Treatment Groups ◽  
Instant Noodles

The effects of instant noodles waste (INW) as a replacement for maize was investigated using 144 day-old, unsexed broiler chicks of Anak strain which were randomly assigned into four dietary treatment groups of 36 birds each. Each dietary treatment group had 3 replicates of 12 broilers per replicate. These four different diets were fed, in which INW replaced maize at 0% (control), 10, 20 and 30% from day old to 8 weeks of age. The growth performance, nutrient digestibility, haematological parameters and carcass traits of the chickens were evaluated. Average final live from 1559.44 g to 1730.91g with broilers fed control diet and 30% INW diet recording the highest and least values respectively among the treatments. Broilers fed the 30 % INW had lower (P< 0.05) live weight. Broilers fed INW based diets had higher blood profile comparable to the control. The results indicated that INW can replace up to 20% of broiler starter diet and 30% replacement of maize at the finisher phase without adverse effects on growth performance of the broilers.  

scholarly journals Evaluation of Ocimum gratissimum and Ocimum canum as natural growth promoters on the growth performance, intestinal microbiota and villi morphometry of broiler chickens

2020 ◽  
Vol 47 (1) ◽  
pp. 186-196
Author(s):  
E. A. Salihu ◽  
P. A. Onimisi ◽  
J. J. Omage ◽  
M. Afolayan ◽  
O. Moses ◽  
...  
Keyword(s):  
Weight Gain ◽  
Growth Performance ◽  
Intestinal Microbiota ◽  
Broiler Chickens ◽  
Growth Parameters ◽  
Growth Promoters ◽  
Crypt Depth ◽  
Ocimum Gratissimum ◽  
Feed Cost ◽  
Final Weight

The study was carried out to evaluate the performance of broiler chickens fed diets containing Ocimum gratissimum and Ocimum canum as an alternative to antibiotic growth promoters (AGPs). A total of 396, one day-old Cobb 500 broiler chicks were randomly allotted to six dietary treatments each replicated thrice with 22 birds per replicate in a completely randomized design. Six treatment diets were formulated containing 0g of experimental materials as control, 400 and 800g of O. gratissimum (T2 and T3), 400 and 800g of O. canum (T4 and T5) while oxytetracycline as recommended by the manufacturer was used as positive control. Data were collected on growth parameters: initial weight, final weight, weight gain, feed intake and feed cost per kg gain at both the starter and finisher phases. All data collected were subjected to analysis of variance and significant differences among treatment means were compared using Tukey procedures. Growth performance result showed that final weight, weight gain, feed conversion ratio and feed cost per kg gain were significantly higher (p<0.05) for birds fed diets containing O. gratissimum and O. canum at 800g per 100kg diets at both the starter and finisher phases. The population of Bacillus and Lactobacillus spp. were increased while the concentration of Escherichia coli, Clostridium spp., Salmonella spp., Enterobacteriaeae and Pseudomonas spp were significantly (p<0.05) reduced by the inclusion of Ocimum spp. Villi area, villi perimeter, height, width, crypt depth and villi height/crypt depth ratio were higher (p<0.05) for birds fed dietary supplement of 400g of O. gratissimum, 400g and 800g of O. canum and AGP (Oxyteracycline) than the control. Addition of O. gratissimum and O. canum in broiler chickens' diets significantly improved growth performance, intestinal microbiota and villi morphometric. Farmers and feed millers can use O. gratissimum and O. canum at 800g/100kg diets for improved performance.

scholarly journals Protected Organic Acids Improved Growth Performance, Nutrient Digestibility, and Decreased Gas Emission in Broilers

Animals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 416 ◽  
Author(s):  
Dinh Hai Nguyen ◽  
In Ho Kim
Keyword(s):  
Organic Acids ◽  
Growth Performance ◽  
Broiler Chickens ◽  
Body Weight Gain ◽  
Basal Diet ◽  
Nutrient Digestibility ◽  
Broiler Chicks ◽  
Feed Conversion ◽  
Gas Emission ◽  
Dietary Treatments

We investigated the effects of a blend of organic acids (OAs) and medium-chain fatty acids (MCFAs) supplementation in 800 1-d-old male Ross 308 broiler chickens (42 ± 0.90 g) in a 7-week study. Broiler chicks were randomly allocated into one of the five dietary treatments (16 birds per pen with 10 pens per treatment). Dietary treatments consisted of corn-soybean meal based basal diet and the basal diet supplemented with blend of OAs and MCFAs at 0.25, 0.5, 0.75 g, and 1 g per kg of feed. In the current study, during the whole experimental period, the inclusion of the blend of OAs and MCFAs in the basal diet linearly improved (p < 0.05) body weight gain (BWG), feed conversion ratio (FCR), and dry matter digestibility. The increasing inclusion of the blend of OA and MCFA levels in the diets linearly decreased (p = 0.002) feed intake during d 1 to 7. Broilers fed diets containing different levels of the blend of OAs and MCFAs showed a linear increase (p = 0.006) in Lactobacillus concentrations and decrease (p = 0.014) in ammonia (NH3) at the end of the experiment. However, the blend of OAs and MCFAs did not affect carcass quality, E. coli, and Salmonella counts, as well as hydrogen sulfide and total mercaptans gas emission (p > 0.05). In conclusion, the blend of OA and MCFA supplementation positively influenced growth performance, DM digestibility, excreta Lactobacillus counts, as well as NH3 gas emission in broiler chickens.

scholarly journals The Dietary Supplemental Effect of Nitroethanol in Comparison with Monensin on Methane Emission, Growth Performance and Carcass Characteristics in Female Lambs

Animals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 327
Author(s):  
Zhen-Wei Zhang ◽  
Yan-Lu Wang ◽  
Yong-Yan Chen ◽  
Luo-Tong Zhang ◽  
Ying-Jie Zhang ◽  
...  
Keyword(s):  
Energy Loss ◽  
Growth Performance ◽  
Economic Efficiency ◽  
Carcass Characteristics ◽  
Basal Diet ◽  
Nutrient Digestibility ◽  
Dietary Energy ◽  
Ch4 Production ◽  
Net Revenue ◽  
Emission Growth

This study was conducted to evaluate the dietary supplemental effects of 2-nitroethanol (NEOH) in comparison with monensin on methane (CH4) emission, growth performance and carcass characteristics in female lambs. Sixty female, small-tailed Chinese Han lambs (3.5 ± 0.3 month) were randomly allotted into three dietary treatment groups: (1) Control group, a basal control diet, (2) monensin group, the basal diet added with 40 mg/kg monensin, (3) NEOH group, the basal diet added with 277 mg/kg nitroethanol, and the feedlotting trial lasted for 70 days. Although dietary addition of monensin and NEOH did not affect nutrient digestibility of lambs, both monensin and NEOH decreased the calculated CH4 production (12.7% vs. 17.4% decrease; p < 0.01). In addition, the CH4 production represents less dietary energy loss in the monensin and NEOH group than in the control, indicating that monensin and NEOH are potent CH4 inhibitors that can reduce dietary energy loss. Dietary addition of monensin and NEOH decreased dry matter intake (p < 0.01); however, they increased the ADG of female lambs (p < 0.01). As a result, both monensin and NEOH increased feed conversion efficiency of the feedlotting lambs (p < 0.01), suggesting that feed energy saved from CH4 production promoted the feed efficiency and ADG in the present study. Except for the fact that NEOH addition increased the net muscle percentage to carcass weight (p = 0.03), neither monensin nor NEOH had a significant influence on carcass characteristics of female lambs (p > 0.05). From an economic point of view, NEOH and monensin caused a reduction in feed consumption costs, therefore resulting in a higher net revenue and economic efficiency than the control. In summary, dietary supplementation of NEOH in comparison with monensin presented a more promoting effect on energy utilization in female lambs by inhibiting rumen methanogenesis more efficiently, and NEOH improved the net revenue and economic efficiency more significantly than monensin.

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