DINH D L T O N G VA THl/C AN CHAN NUOI
Anh huong cua sy bo sung acid glutamic len I3ng trgng.
chat tmmg quay Ihpt. ty le heu hoa duong chat va hieu qua kinh le ciia tho Califomian tang truong. Tap chi Khoa hijc Trucmg Dgi hpc Can Tho. So' chuyen de Nong nghiep, 2: 168-73.
19, Tu D.T.M (2012). Manipulation of Ihe nutritive value of duckweed (Lemna minor) as a feed resource for local Muscovy ducks. MSc Thesis in Agriculhiral Sciences Animal Husbandry. Cantho University
20, Tugiyanii E., T. Yuwanla, Zuprizal and Rusman (2013).
Improving Performance. Meat Quality and Muscle Fiber
Microstructure of Native Indonesian Musco\'\' Duck Through Feed Protem and Metabolizable Energy' Int J.
Poul-Set.. U(ll): 653-59.
21. Bui Thanh Tung, Nguyen Thanh Hai va Phan Ke Son (2018) Nghien ohi bao che curcumin dang phylosome va dang PEG h6a. Tap chi Khoa hoc DHQGHN. 34(1), 29-41- 22. Van Soest P.J., Robertson J.B. and Lewis B.A. (1991), Symposium; carbohydrate methodologj'. metabolism and nutritional implication in dairy cattle: methods for dietary fiber and nonstarch polvsaccharides inrelation to animal J Dair>' Sci, 74: 3585-97.
ANH H l / d N G M d c BO SUNG CHE PHAM PROBIOTIC VAO KHAU PHAN DEN KHA NANG SINH T R l / d N G CUA VIT XIEM
Nguyen Thuy Linh'', Nguyen Tlii Ddu', HdQuoc Dgt' vd Nguyin Tlii Kim Quycn' N g a y n h a n bai bao: 11/03/2019 - N g a y n h a n bai p h a n bien: 30/03/2019
N g a y bai b a o d u p c c h a p n h a n d a n g : 12/04/2019 T O M T A T
Nghien ciiu nay nham xac djnh anh h u d n g o i a viec bo sung che'pham Probiotic trong khau phan len kha nang sinh tru'dng ciia vit Xiem giai doan 5-8 tuan tuoi. Vit Xiem trong thi nghiem la ciing gioiig, can bang trong mai, khoi lugmg dau vao tuong d u a n g va ciing dieu kien cham soc nuoi d u d n g . Thi nghiem d u g c bo tri theo the thiic hoan loan ngau nhien vdi 4 nghiem thiic va 3 lan l$p l^i, Cac nghigm ihiic la cae miic dg bo sung Probiotic trong khau phan 6 cac miic 0; 0,25; 0,35 va 0,45% probiotic. Ke't qua cho tha'y rang khau phan bo sung vdi miic 0,35% probiotic trong khau phan ciia vjt Xiem giai do^n 5-8 tuan hioi ve lang khoi lugng, khdi lugng cuoi thi nghiem va he so' chuyen hoa thuc an deu cao hon (P<0,05),
Tir khoa: Vit Xiem, Probiotic, tdng khdt Iugng, he sd'chuyeh hoa thirc dn.
ABSTRACT
Effect of dietary Probiotic levels o n growth performance of Muscovy ducks A study was conducted to determine the effects of Probiotic levels in diets on the growth performance of growing Muscovy ducks from 5 to 8 weeks of age. Birds in each treatment were selected in the same breed, sex, initial weight and take care conditions. The experiment was a completely randomized design with 4 treatments and 3 replicates. The treatments were ProbioHc levels of 0, 0.25,0.35 and 0.45%, respectively. The results showed that the dietary' Probiotic levels of 0.35% was optimal for Muscovy ducks from 5 to 8 weeks of age, in weighl gain, final live weight, feed conversion ratio (P<0.05).
Keywords: Muscovy duck, probiotic, weight gain, feed conversion ratio.
I.DATVANDi
Vit Xigm (Muscovy duck) hay edn gpi la Ngan, cd ten khoa hpc Cairina moschala, co ngupn gd'c Trung va Nam My (Anonymous, 2012). Thit vit Xiem dupc nhieu ngudi ua ' Trux^g Diji ht,ic Tr.i \'inh
• Tac gia lien he TS, Nguyen Thiiy Linh - Tnrong Dai hgc Tra Vinh. So 126 Nguyen Thien Thanh - Khom 4, Phucmg 5, Thanh pho Tra Vinh, Tinh Tra Vinh, Di?n thogi: 0907,145 909, Email thuyIinh80@'tvu edu.vn
chudng htm so vdi phan ldn thit tir cae gio'ng vit khac do eo lie rpng, ty le nae cao htm, it md (Parkhurst va Mountney, 1988; Adesope va Npdu, 2002), thit mem va thom ngon co gia tri dinh dudng eao 19,6-21% CP (protein tho) va 2,47% EE (beo) (Dong, 2005), Trong qua trinh ehan nuoi gia cam noi chung, vit Xiem noi rieng khang sinh ddng vai trd quan trpng khdng chi trong phong tri benh ma cdn dupe sir dung nhu ehat kich thieh sinh trudng cua
D I N H D l / O t N G V A T H U C A N C H ^
vat nudi (Pham Kim Dang va ct\', 2016). Tuy nhien, tinh hinh lam dung khang sinh trong chan nuoi da dan de'n si/ khang thud'c cua cac vi sinh vat gay benh, du lupng thud'c khang sinh trong thuc pham da gav anh hudng de'n sire khoe ngudi Heu dimg (Newman, 2002).
Che pham probioHc dang dupc danh gia nhu mgl giai phap thay the'higu qua va cung cap mgl phuong thuc an loan ben viing dd'i vdi vat nudi va ngutri lieu diing. Thuc le, su dung che'pham probiotic mang lai rat nhieu lpi ich nhu hd trp tieu hda thiic an, can bang he vi sinh dudng rugt bang each canh tranh vdi vi khuan gay bgnh eho vat nudi (Kabir, 2009), tir dd giam ehi phi trong phong bgnh, tang higu qua chan nuoi, dam bao chat lupng thit va siic khoe ngudi tieu diing, Vi thei chung tdi tie'n hanh nghien ciiu "Anb huang cua viec bdsung cbi'phdm Probiotic vdo khdu phdn de'n ndng sudi sinh trudng eiia vit Xiem dia phuang".
2. VAT L I | U VA PHUDNG PHAP NGHltN CUTU
2.1. Vat ligu
Dja diem: Thi nghigm dupc tie'n hanh tai tr^ii chan nudi thuc nghigm, Trudng Dai hpc Tra Vinh
r/iiV( gian: Tii' thang 06/2018 den thang 10/2018.
Ddi tugng. Vit thf nghiem dugc nudi iim tu' 1 ngay ludi de'n 28 ngay tud'i va chiing ngiia khang the viem gan, vaexin djch la va H5N1 trudc khi dua vil vao thi nghiem. Vil duge bo tri vao lhi nghigm liie dau tuan tudi thu 5 co khdi lupng 715-732 g/eon cho giai doan 5-8 tuan tudi.
Chuong trgi: Chudng trai dupc xay dung 2 mai, co dp thong thoang khi tot. Vit Xiem dupe nudi tren nen trang xi mang cd eha't dpn chudng bang Ira'u, vdi mdi 16 ngan bSng ludi kem, dign rich mdi 6 chudng cho mpt dan vi thi nghigm la 4,8m- de nuoi 10 con vil.
Thirc dn: Thiic an sir dung la thtic an hdn h(pp tu trdn (dang bpt). Thue lieu dupc sir dung pho'i hop tiong lhi nghiem bao gdm bap, ta'm, cam gao, bpt ca, dau nanh hat va che' pham Probiotic.
Che'pham Probiotic: San phan - ' ^ " g cap bdi cdng ly TNHH Don.. Thanh phan trong 1kg che pham Pi •!> '"•" go"^
Vitamin A (min): l.OOO.OOOUl; Vitamin Dj (min): lOO.OOOUI; Axit Folic (mm): 200mg;
Lactobacillus acidophilus (min): 20.10" CFU;
Bacillussuhtilis{n-\m):2i^.WQY\J;Saccbaromyces cerevisiae (min): 20.10" CFU; Bacillus polymyxa (min): 20,10^ CFU; Khuye'n cao sir dyng trgn 0,25% vao thiie an hon hpp.
2.2. Bd tri thi nghiem
Thi nghigm dupc bo tri theo the thtic hoan loan ngau nhien gom 4 nghiem thiic (NT) luong ling vdi 4 khau phan la 4 miie (%) bo sung che'pham Probiotic (NTO; NT0,25; NT0,35 va NT0,45) vdi cung mue 18% CP, moi nghigm thiie dupc lgp lgi ba lan, Moi don vi thi nghigm CO 10 con vil Xiem cd khdi lu'png tuong du'ong nhau va can do! ve ty lg trd'ng mai.
Cdng thlic khau phan, thanh phan hoa hpc cita cae khau phan thi nghigm trong giai d o ^ 5-8 tuan tud'i dupc trinh bay qua Bang 1 va2.
Bang 1. Cong doan 5-8 tuan
thlic khau phan thi nghigm giai tuoi a cac miic probiotic (% DM)
Thuc li^u (%)Bip Ta'm Cam Dau nanh h^it Bgtca Probiotic Tong Bang 2. Thanh
Thuc U?u (%) DM OM CP EE NFE CF Ash Lysine Methiorune ME(MJ/kg DM)
NTO 20,5 9,30 53,4 8,00 8,80 0,00 100
NT0,2.
20,2 9,35 53,4 8,00 8,80 0,25 100 phan hoa hpc va
NT0,35 20,1 9,35 53,4 8,00 8,80 0,35 100
NT0,45 20,0 9,35 53,4 8,00 8,80 0.45 100 ME Clia cac khau (Hnh theo % DM)
NTO 89,6 93,3 18,0 7,60 62,0 5,64 6,71 0,92 OM 12,82
NT0,25 89,6 93,0 18,0 7,60 61,8 5,64 6,94 0,92 0,34 12,77
NT0,35 89,7 92,9 18,0 7,57 61,7 5,61 7,05 0.92 0,34 12,77
NTO45 89,6 92,8 18,0 7,59 61,6 5,63 7,13 0,92 0.34 12,74
KHKT Chdn nuoi so 246 - thdns 7 ndm 201Q
D I N H D l / O N G VA T H l / C A N C H A N N U O I
Vjt thi nghigm dupc cho an 2 lan/ngay (7 va 17 gid). Mang an, mang ud'ng dupe bo' tri rieng trong nidi ngan chudng. Thiic an thira dugc thu va can l^i vao sang hom sau de ti'nh lugmg an tieu thp hang ngay. Vil dupe cung eap nudc ud'ng day du sud't ngay dem.
Thanh phdn bod hoc ciia thirc an: vat cha'l khd (DM), vat cha't huu ca (OM), protein thd (CP), khoang tdng sd' (Ash) dugc phan tieh theo AOAC (1990).
Gia tri ME ciia cac nguyen ligu dupc tinh theo de xua't cua Janssen (1989, dan tir NRC, 1994).
Bip: ME - (36,21 xCP)+(85,44xEE)+(37,26x NFE)
Ta'm: ME (46,7xDM)-(46,7xAsh)- (69,55xCP)-H(42,95xEE)-(81,95xCF)
Cam: ME-(46,7xDM)-(46,7xAsh)- (69,54xCP)+(42,94'<EE)-(81,95xCF)
Dau nanh hat: ME = (36,63xCP)+(77,96xE E)+(19,87xNFE)
Bpt ca: ME {35,87xDM)- (34,08xAsh)+(42,09xEE).
Lupng thlic an va dudng chat lieu thu, l3ng khoi lupng ca the, klioi lupng liic kel Ihiic giai doan 5-8 luaii lud'i.
2.3. Xu ly sd ligu
So' ligu dupe xir ly sa bp tren Microsoft Excel (2013) va phan Hch bang ANOVA tren phaii niein Minitab 16.1.0 (2010). Tukey test dugc sir dung de so sanh gia tri Mean vdi do tin cay 95%.
3.K£TQUAVATHAOLUAN
3.1. Thiinh phan dinh dudng cua thuc lieu diing trong thi nghigm
Qua Bang 3 cho tha'y ham lupng DM eua bap, cam, tam gan tu'emg dutmg nliau, nam lrong khoang 86,0-89,8%. Trong dd bpt ca la thyc ligu diing de dieu ehinh ham lupng CP trong khau phan nen ham lupng CP cao (60,4%). Bot ea cd CP cao vi day la loai su dung cho gia cam, ket ejua nay cao hon ke't qua bao cao cua Nguyen Ddng Hai (2016) hi 55,0%.
Tuy nhien, CP nay nay thap hon so vdi bpt
ca tra trong nghien ciiu cua Pham Tan Nlia (2014) la 65,4%. Ket qua ME cita hip tiong thi nghiem nay phii hpp vdi nghien cuu cua Nguyen Dong'Hai (2016) la 15,8 MJ/kg.
Bang 3. Thanh phan hoa hgc va gia tri ME ciia cac thuc lieu duoc sii dung trong thi nghigm
(% DM)
Chi tieu Bap Cam Tam B9I ca Dau nanh DM 87,2 89,8 86.0 92,9 95,4 OM 99,0 91,9 99.5 80,6 95,3 CP 8,52 12,0 9,03 60,4 42,0 EE 3,16 8.43 2,87 8.05 17,3 NFE 84,2 63,8 86,1 11,1 27,6 CF 3,11 7,63 1,51 1.02 8,40 Ash 0,97 8,04 0,46 19,4 4,71 Lys 0,34 0,54 0,23 3,96 2,12 Met 0,14 0,25 0,16 1,27 0,55 ME (MJ/kg) 15,75 11,38 14,08 12,59 14,37 3.2. Lupng Ihii'c an, dudng chat va ME tieu thu Clia vit Xiem
Ke't qua trinh bay tai Bang 4 eho tha'y lupng DM, OM, CP tieu thu giam dan tit NT0,45 (85,3 g/eon/ngay) va dat eao nha'l o NTO {88,8 g/eon/ngay) va co y nghia thd'ng ke (P<0,05).
'Tuy nhien, d NT0,35, lupng DM Ihue an tieu thu lai giani nhe (85,9 g/eon/ngay). Ke't qua DM lieu thu trong thi nghiem nay phii hpp vdi Iskandar va ctv (2001), nghien ciiu tren vit Xiem tio'ng dia phuong vdi muc nang lupng trao ddi la 12,55 MJ/kg va 20% CP cd lupng DM tieu thil la 85,8 g/con/ngay. Tuy nhien, kel qua lupng DM tieu thu lrong thi nghiem nay tha'p hem lupng DM tieu thu 117,5 g/con/ngay khi nghien cuu tren vil Xiem giai doan 3-6 tiian tudi vdi kha'u phan 12,23 MJ/kg va 18%
CP ciia Abd va etv (2012); Baeza va Leclercq (1998) nghien cuu tren vit Xiem giai doan 0-8 tuan tudi la 106 g/eon/ngay, su chenh lech nay cd le do 2 thi nghiem co su khae nhau ve gid'ng vit Xiem, ehe'dp dinh dudng cua kha'u phan va dieu kien cham soe nudi dudng. Lupng EE va CF tieu thu giam dan (P<0,05) khi lang mire che'pham probiotic trong kha'u phan do ham lupng cac dudng ehat nay tha'p d cac nghiem thlic CO mue ehe pham Probiotic cao.
49
risra rfiifi KoFi T.; AW iu 'l/fsr, "I x D I N H D U O N G VA T H l / C A N C H \
Bang 4. L u g n g I h u c an, d u o n g chat va ME tieu thu ctia vjt Xiem t r o n g giai d o ^ ^-> tii-m turn s ce-, ng.iN 1
DM OM CP EE NFE CF Ash Lys Met ME (MJ/con/ngay)
,v;,8' S2S' 15,9*
6,74' 55,0*
5,0T 5,95 0,82' 0,30- 1,13'
87, H 81.0^^
15,7- 6,62"- 53,9^*
4.91-'- 6,04 0.80^^
0,29' l,!!-^
85,9''' 79,8'' 15,5'"
6,50'- 52,9'' 4,81'' 6,05 0,79''- 0,28"
1,09"
85,3'' 79,1'' 15,3^
6,47'-
6,08 0,78''
0,65 0,60 0,12 0,05 0,39 0,04 0,04 0,01 0,01 0,01
0,021 0,011 0,021 0,015 0,010 0,013 0,297 0,021 0,001
Gic gid tri trting binh n PO.05
c cInr a, b vd c tren cimg nigt hdng khtic nhau Id khac biet co y ngliia thong ke d muc
Lupng ME Heu thu giam dan khi lang muc probiotic trong eac NT (P<0,05), vdi gia trj thap o NT0,35 va NT0,45 (1,09 va 1,08 MJ/
eon/ngay) va dal gia tri eao nha't d NTO (1,13 MJ/eon/ngay). Ke't qua nay co the giai thieh la do lupng DM tieu thu giam hon d eac NT co miic probiotic eao. Ke't qua nghien a i u nay phu hgrp vdi ke't qua ciia Dong (2005) nghien eiiu tren vit Xiem vdi khau phan ed mue nang lupng la 12,9 MJ/kg va 18,8% CP co lupng ME lieu thu la 1,13 MJ/con/ngay.
3.3. Tang khdi lupng, khdi lugng co the va he sd chuyen hoa thtic an ciia vit Xiem
Ke't qua tai bang 5 cho tha'y tang khdi lupng tlia'p nha'l d NTO (41,5 g/con/ngay) va dat gia tri eao nha't d NT0,35 (47,3 g/con/ngay) va sai khac giua chung ed y nghia thd'ng ke {P<0,05)-
Kel qua nay cd the dupc giai thich la do lupng DM, OM, CP va ME tieu thu giam dan tir NTO de'n NTO,45 vdi muc bd" sung probiotic tang len qua mirc lieu sir dgng khuye'n eao dan deh tang kho'i lupng cao nha't d NT0,35 va co xu hudng giam d NT0,45, dieu nay cho tha'y bo sung probiotic d mirc phii hpp cho tang khoi lupng cao nha'l. Gia tri dat dupc ciia nghien cuu nay cao hon ket qua nghien eiiu ciia (Miclosanu va Roibu, 2001) tren vit Xiem giai doan 5-8 tuan tudi vdi khau phan ME 12,55 MJ va 18% CP la 34,9 g/con/ngay; Schiavone va etv (2007), tren vit Xiem sir dung khau phan muc ME12,13 MJ, 20% CP la 36,9 g/eon/ngay.
Tang khdi lupng chenh lgnh giira cae nghien cuu CO the la do khau phan nang lupng, eon gidng, dieu kien eham soe nuoi dudng, dieu kien sinh thai khac nhau.
Bang 5- Tang khdi lupng, khdi lupng co the va FCR ciia vit Xiem trong giai doan 5-8 tuan tuoi (g/con)
Chi lieu KL dau TN, g/con KL cuoi TN, g/con Tang KL, g/con/ngay FCR
CP/tang KL (g/kg) ME/tang KL (MJ/kg)
NTO 727,3 1890"
41.5"
2,14-' 385,3' 27,5-
NT0,2S 728,3 l-gji*"
43,1'^
2.02*"
364,3""
25,8-'' NT0,35
715,3 2.039' 47,3'' 1,82'' 327,8"
23,3"
NT0,45 732,0 1.988*"
44.9-- 1,90"
342,3"
24,2"
SEM 7,08 30,3 1,05 0.05 9,23 0,66
P 0,425 0,037 0,024 0,011 0,011 0,009
50 KHKTChdn nudi so 246 - thdns 7 niim 2019
DINH DUONG VA THLfC AN CHAN NUOI
Khoi lupng co the vil Xiem liic ket thuc giai do^n 5-8 tuan tud'i tuong ung vdi ke't qua I3ng khd'i lupng eo the qua eac nghiem thiic.
Khdi lupng CO the thap d NTO la 1.890g, sau do lang dan va cao nha'l o NT0,35 (2-039g) va si^ sai khac giiia chung ed y nghia thd'ng ke (P<0,05), do vil d NT0,35 nay cd tang khdi lirpng cao nha't. Ke't qua nay phii hpp vdi ke't qua nghien cuu Iren vil Xiem ciia Gaafar va ctv (2013), vdi khoi lupng la 1.983g. Tuy nhien, gia tri Hm tha'y eiia chiing toi cao hon ke't qua dupc cdng bd ciia (Miclosanu va Roibu, 2001) tren gid'ng vit Xiem dupc nuoi khau phan ME 12,55 MJ va 18% CP co khoi lupng la 1.888g va ke't qua cua Schiavone va ctv (2007), nghien euu tren vit Xiem sir dung kha'u phan cd ME la 12,13 MJ va 20% CP la 1.828g. Su khac bigt nay cd le do khae nhau ve che'dp dinh dudng va con gio'ng.
Hg so'chuyen hoa thirc an cao htm d 2 NTO va NT0,25 va thap nhat d 2 NT0,35 va NT0,45 eo y nghia thd'ng ke (P<0,05). Ke't qua nay dupc giai thich la do NT0,35 va NT0,45 ed TKL eao htm so cae NT cdn lai. Gia tri FCR nay phii hpp vdi ke't qua 2,04 nghien ciiu tren vit Xiem Clia Gaafar va ctv (2013). Tuy nliien, ke't qua nay thap hon 2,71 tren nghien cuu vit lai cua Baeza (2012), 2,94 tren vil Xiem (Miclosanu va Roibu, 2001) la do tac gia Hnh cho sud't giai doan 1-8 tuan tud'i.
Su chenh Igch ve he so chuyen hoa thii'e an la do su chenh Igeh ve tang khoi lutmg va lugmg thiic an tieu thu sud't Ihdi gian thf nghigm giiia nghigm thuc ddi chiing vdi cae nghigm thiic eo bd sung che pham Probiotic.
Dieu nay dung theo phat bieu cda Fuller (1999) khi cho rang nliiing anh hudng co lgi Hem tang ciia chat trp sinh cho dgng vat la su tang td'c dp tang trudng, cai thign chat lupng thirc an va giup eho con vat ha'p thu dudng chat tdt hon.
O giai doan 5-S tuan tudi, khau phan nuoi vit Xiem dia phucmg cd mue bd sung 0,35%
probiotic cho tang klioi lugng va khoi lupng cudi giai doan nay cao hem.
TAI UEU THAM KHAO
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S. Fuller R. (1999), Probiotics for farm animals, Probiotics a cntical review. N e w Z e a l a n d . P p 19.
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11. I s k a n d a r S., N u g r a h a V.S,, Suci D . M . a n d S e t i o k o A.R.
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ANH Hif ONG CUA TY LE THO TINH TRONG KHAU PHAN AN DEN NANG SUAT, CHAT LURONG StfA VA BENH CHAN MONG
Dirang Nguyen Khang''vd Trdn Xudn Lam' N g a y nh^in bai bdo: 11/03/2019 - \g6>- n h a n bai p h a n bign: 30/03/2019
N g a v bai bao d u g c cha'p n h a n d a n g : 14/04/2019 T O M T A T
Nghien ciiu nham khao sat anli h u d n g cua ty Se tho tinh trong khau phan an len nang sua! va chat lupng sua, diom van dgng va the trang, dgng due va phoi gio'ng, bieu hign bgnh chan mong lgi Tr^ii bo sua, Trung tam Nghien ciiu Chuyen giao Klioa hgc Cong nghg, Dai hgc Nong Lam Thanh pho Ho Chi Minh lir thang 7/2017 den 6/2018. Ket qua cho thay nang suat sua d khau phan co ty lg tho linh tha'p 411/60 la cao nha't, ke den 6 khau phan 60/40 va thap nha't 6 khau p h a n 80/20, lan lugt la 18,54; 17,51 va 16,74 kg/con/ngay (P<0,001). Chat klio sii'a cao nhci't 6 khau phan 80/20 la 8,67 va thap nhal 6 khau phan co t)- lg tho linh 40/60 la 8,41. Ham lugng dam sira cao nha'l d khau phan CO ly lg tho tinh 80/20 la 3,92, Ihap nhii't d khau phan 40/60 la 3,79. Ham luc.mg beo sua cao nha'l 6 khau phaii 80/20 la 3,88, Ihap nhat o khau phan 40/60 la 3,78. Di lai va diem the trang d kha'u phan 80/20 \'a 60/40 tot hem o khau phan 40/60 la 0,5. Sd lan phoi giong 6 kha'u phan 80/20 cao htm 6 kha'u phan 40/60 la 0,5 lan.
Til khoa: Ti/ Ie thd tinb. nang suat vd eba't lugng siia, dii-iii the'trgng.
ABSTRACT
Investigation of effect of roughage-concentrate ratio in diets on dairy lameness prevention The aim of this studv was to investigate the effect of roughage-concentrate raho in diets on milk vield and qualil)', locomotion and bodv scores, insemination, lameness detection of cows al Dain,- farm. Research and Technology Transfer Center, Nong Lam University of Ho Chi Minh City from Jul 2017 to Jun 2018, The results shown that the highest milk yield in diet with roughage- concentrate ratio of 40/60, followed in diet of 60/40 and lowest in diet of 80/20 were 18.54, 17.51 and 16 74 kg/head/day respectively (P<0-001)- The milk solid content was highest in diet with roughage-concentrate ratio of 80/2o' by 8.67% and lowest in diet with roughage-concentrale ratio of 40/60 b\' S 4 1 % The milk protein content was highest in diet with roughage: concentrate ratio of 80/20 bv 3.92''o, and lowest in diet with roughage-concentrate ratio of 40/60 by 3,79%. The highesl milk fat conlenl in diel wilh roughage-concentrate ratio of 80/20 by 3 88%, and lowest in diet with
' Truimg D.n hpc Xoni; lam Thanh pho Ho Chi Minh
• Tac gia hen he: Dirong Nguyen Khang - Trung lam nghien cu Chl Nhnh DT: 0989390179;'ErTiail: duongnguyenkhang^gmail.c
va chuyen giao KHCN -Truong Dai h(x N'ong lam tp- Ho
fCJiK-^rLn i n 746 - lb Ana 7 n/m, ^liia