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AlXIH HUOIXIG CLIA B O 5UI\1G CO S T Y L O V A O
KHALI PHAIVI CO S A DEIV
K H A IMAIVG 5 I I \ H TRUOIXIGVA HIELI QUA 51J DLJIVIG THUC AIM CUA BO THfT TO
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Nghien ciiu duoc tien hanh nhim danh gia anh hudng cua vide cho an tu do (ad libitum) h6n hgp co stylo 184 va CO sa theo ty Id 3:1 den sinh tmdng cua 2 nhom hd: Lai Bind va bd Fl (LS x Br) so voi vide chi nuoi bo bang co sa. Kit qua cbo thay: 1) bo sung co stylo vao kh£u phan co sa theo ty Id 1:3 cai thidn mot cdch dang ke luong an vao ciia bo nuoi sinh tnrong d ca 2 nhom, luong an vao tSng 22 - 23% so vcri khau phan chi CO CO sa; 2) bo lai Sind nuoi duong bing co sa tu do co tdc dp sinh trudng kha cao (648.11 gam/ngay) va cao ban dang ke so voi bo lai Fl OLS x Br), ti-ong khi do d 16 cho an tu do h6n hop co stylo va co sa theo ty le 1:3 tbi bo lai cbo tSng khdi lugng cao ban; 3) toe dp tang khdi luong ciia ca hai nb6m bo a 16 cho an ttr do CO hdn hop cao bon so voi 16 chi cbo an co sa (765.22 gam/ngay so vdi 648.11 gam/ngay d b6 lai sind va 789.11 gam/ngay so vdi 570 gam/ngay ddi v6i F,(Br x LS); 4). Gia thanh dl san xuit mpt kg thit b6 hoi bang each cho an tu do co h6a thao hodc hdn hop co h6a thao va co stylo kha thap (14.000 den 16.900 dong so voi gia ca thi trudng ciing luc (35.000 den 40.(XX) dong).
Til khoa; Anh hudng. stylo 184. cd sa. bd sinh trudng. bo lai Sind, FlfLSxBr).
L BAT VAN BE
Trong khuon kho ciia du i n FAP triln khai tai huydn EaKar, tinh Dik Lik mdt bp phin k h i ddng cie ndng hp vd beo bd chuyin sang trdng cd, nudi bd lai d l cung cap bd thit cho cic thi trudng thinh phd ldn nhtr I T . Hd Chi Minh, D i Lat, Nha Trang... (TruongTan Khanh va cs., 2010). Cic gidng bd thudng sir dung trong he thdng niy Ii bd lai Sind, hoic bd lai giua lai Sind vdi cic gidng bd ngoai (chu ylu li Brahman, Drought Master, Red Angus vi Limousine). Bd thudng dupe nudi thinh hai giai doan: 1) giai doan nudi sinh trudng bit dau tir 6 (hoic 12) thing tuoi d i n 18 - 21 thing tudi, 2) giai doan vd beo keo dii 2 - 3 thing v i thudng bin bd Iiic 24 - 26 thing. Van d l cua ngudi chin nudi liic niy li ky thuat nudi dudng thich hop d l nudi sinh trudng bo lai cd hidu qua. Trong khudn khd ciia du in FAP d i tiln hinh nghidn ciru d l tii bo sung cd stylo vio khau phan cd sa nudi sinh trudng bd lai tiJ 18-21 thing tudi.
Muc tidu cua nghidn ciiu: Dinh gii anh hudng ciia bd sung cd stylo vio khau phan cd sa din lupng tinic an i n vio, kha nang sinh trudng v i hidu qua sir dung tinic i n cua bd giai doan 18-21 thing tudi.
L VAT UEU VA PHUONG PHAP N G H I £ N CUU 1. Ddi tugng nghifin ohi:
Khoa Chan nuoi Thu y - Trudng Dai hpc Tay Nguyen
Bd lai Sind (LS) v i bd lai Fj giira lai Smd vi Brahman (Fj) tir 18 - 21 thing tudi.
2. Vit li^u nghidn cuu:
Cic khau phin i n dua trdn nin thuc in Ii cd trdng bao gdm cd s i (Panicum maximuni) va cd stylo 184 (Stylosanthes guianensis CIAT184). Thinh phan dmh dudng ciia cic loai thuc in trong thi nghidm dupe trinh biy d bang 1.
Kit qui phin tich tai phdng thi nghidm Trudng Dai hpc Tiy Nguydn.
Dia diem nghidn cuu: Tai x i Ea Kmut, huydn EaKar, tinh Dik Lik.
Thdi gian nghien ct/u.Tu nim 2008 - 2009.
3. Phuong phip nghiin cuu
Bd tii thi nghidm: Thi nghidm dupe bd tri theo phuang phip phin Id vdi hai khau phan i n v i hai nhdm gidng bd dang nudi phd biln tai huyen EaKar.
Quy tiinh nudi dudng bd thi nghidm
Ld la, lb: Cho in tu do cd s i (adhbitum): cd s i thu d 30 ngiy tudi, dupe cit nho 10 - 15 cm v i cung cap thudng xuydn sudt ngiy ddm fludn cd cd day trong mang in).
Ld 2a, 2b: Cho i n tu do hdn hpp cd s i v i cd Stylo 184 (Stylosanthes guianensis CIAT184) duoc trpn theo ty le 3:1 tinh theo khdi lupng tuoi vi cung cap tu do ca ngiy v i ddm.
NONG NGHIEP VA PHAT TRIEN NONG THON - KY 2 - THANG 2/2012
81KHOA HOC
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Bing 1: Thinh phin dmh duOng tiiiirc in sii dung trong thi nghi|m*
Cd stylo 184 tuoi (45 ngiy tudi) Cd si tuoi (30 ngiy tudi)
VCK
(Vkg)
24,15 18,15
Protein thd (%/kg so vdi VCK)
17,5 10,80
Ning lupng (kcal ME/kgTA)
490 533 Ld thi nghiim
Bd tri gia sue Gidng bd
Sd lupng bd thi nghidm (con) Tudi (thing)
Khdi lupng trung binh (kg/con) Nudi dudng
Thiic in xanh Nudc udng Thdi gian nuoi
Bing2:Sad6 la LS
5
)d tri thi nghi|m lb
F,(BrxLS) 5 213,32 242,52
Cd si cho in ti; do (Adlibitiim)
2a LS
5
2b F,(BrxLS)
5 L8-21
220,61 235,59
Hdn hpp cd hda thio vi stylo theo ty II 3:1 (75% cd sa + 25% cd stylo)
cho in tu do (Adlibitiim) Tudo
Trong 90 ngiy Cic chi tieu theo ddi
Bd thi nghidm dupe nudi ci thi, cic chi tidu theo ddi nhu sau:
Lupng in vio: Luang in vio cua bd dupe theo ddi bing cich cin chinh xic lupng thiic in cho in trong ngiy vi lupng thuc in thira vio sing sdm hdm sau trude khi cho in thuc in mdi.
Khdi lucmg co the: bd dupe cin vio budi sing khi chua cho in, cin Udn tuc trong ba ngiy dl Iiy sd lieu trung binh. Trong thi nghidm niy bd dupe cin 2 Ian: khi bit dau vi kit thiic thi nghidm.
Tdc dp ting khdi lupng tuydt dd'i. dupe tinh theo cdng thuc:
XXTD = ^ 2 - W | (gam/con/ngdy) T2-T1
Trong dd Wj, W2 li khdi lupng bd thi nghi|m liic bat dau vi kit thiic thi nghidm; Tj vi T2 la tiidi gian bit dau vi kit thiic thi nghidm.
Cac so sanh trong thi nghi?m: So sanh sinh tnrdng cua cimg mpt loai bo vai cac khau phan nuoi khae nhau; so sinh sinh trudng ciia hai loai bd trong cimg khau phan nudi gidng nhau.
Xulysdheu
Sd lieu thi nghidm dupe xir ly thdng kd trdn phan mim Minitab phidn ban 14; cac sd lidu dupe trinh bay ti-ong bio cio bao gdm sd trung binh, sai sd chuan (SE), sir dung T-Test dl so sanh cac sd ti-ung binh vdi dp tm ciy 95%.
LKFTQUAVATHAOLUAN
1. Luprng in vio ciia bd thi nghi|m
Kit qua theo doi chi tidu vl lupng in vao cho th^y bd sung cd stylo vio khau phan vdi ty Id 25% da lim ting lupng in vio cua gia siic. Bd d ca hai giong lai Sind vi Fi(LSxBr) d Id cd bd sung cd stylo co lupng in vio cao han mpt each cd y nghla so voi bo c Id chi cho in cd sa (p<0,05).
Lupng in vio Id 2a vi 2b (cd bd sung stylo 184) la 7,00 kg vi 7,19 kg VCK/con/ngiy, ti-ong khi lupng Sn vio tuong ling cua Id la vi lb (chi bd sung cd sa) chi 5,73 vi 5,83 kg VCK/con/ngiy (ting 22%). Tuong tu nhu viy, lupng protein ciia bd lai Sind vi bd Fi(LSxBr) d Id cd bd sung cd stylo cao hon mpt cich cd y nghia (p<0,05) so vdi Id khdng bo sung (bang 3). Ty le proein thd trong VCK in vao ciia cic Id nhu sau: 16 la vi lb la 10.8%, Id 2a va 2b la 12,79%. Phan ti-im VCK in vio so vdi khdi lirpng ctia ca thi d cic Id thi nghiim li: Id la: 2.36; lb: 2,17; 2a: 2,74 va 2b: 2,65.
So sinh lupng in vio ciia hai nhdm gidng trong cimg mdt phuong thiic cho in cho thay lupng in vao cua 2 nhdm bd trong ciing mpt phuang thiic nu6i dudng sai khic khdng cd y nghla tiidng kd (p>0,05).
a Id 1 (chi cung cap cd sa) bd lai Sind cd lupng an vio la 5,73 kg VCK/ngay, b-ong khi do bo lai Brahman li 5,83 kg VCK/ngay, tiiang tii nhu viy ff 16 2 (2a: 7,00 vi 2b: 7,19 kg VCK/ngay).
Theo Stiir vi Home (2000) lupng in vao cua bo sd ting lln khi kh^u phdn cd ty ll protein cao, khi bo
KHOA HQC CdNG NGHfi
sung 30% cd diu vio khau phan se lim luong in vio in vio ciia bd Id la vi lb trong thi nghidm niy khi tir 7,5 din 9,5 kg VCK/con mdi ngiy. Theo Presston tiiap (2,36% vi 2,17%), ti-ong khi bd d Id 2a vi 2b cd vi Willis (1967) tiii lupng VCK in vio so vdi khdi lupng in vio cao ban (2,78% vi 2,65%).
lupng ca till ehilm khoang 2,8 - 3%, nhu viy lupng
Bang 3: Lupng in vio hing ngiy ciia bd thi nghi|m LdTN
Cd si tuoi (kg) Cd stylo 184 tirai (kg) VCK in vio (kg) Protein thd in vio (g)
M SE M SE M SE M SE Ty Id protein ti-ong VCK in vio (%)
% VCK in vio so vdi khdi lupng ca thi
la 31,55
0,44 0,00 0,00 5,73"
0,12 618,38"
14,5 10,80
2,36
l b 32,12
0,23 0,00 0,00 5,83"
0,21 629,55"
16,2 10,80
2,17
2a 26,70
0,15 8,90 0,09 7,00'' 0,35 894,45''
12,5 12,79
2,74
2b 27,45
0,34 9,15 0,04 7,19''
0,24 919,58''
16,25 12,79 2,65
Cic chi so a, b, c dd'so sinh cic sd trung binh tiong cung mdt hing, cic chu khic nhau thd hidn sai khic cdy nghia vdip<0,05
2. Kha ning sinh trudng ciia bd thi nghi|m Kit qua theo doi cic chi tidu sinh tnrdng cua bd dupe trinh biy d bang 4.
So sinh tdc dp sinh tnrdng cua bd lai Sind vi Fi(LSxBr) ti-ong ciing 1 phuang thire nudi dudng cho tiiay: O Id khdng bd sung stylo bd lai Smd ting khdi lupng li 648,11 g/con/ngiy vi cao hon so vdi bd Fi(LSxBr) li 570 g/con/ngiy, sai khic cd y nghla vdi p<0,05; a Id cd bd sung stylo (ty Id 3:1), tdc dp sinh ti-udng ciia bd Fi(LSxBr) cao han so vdi bd lai Smd
(p<0,05), Gai Sind: 765,22 gam/ngiy so vdi Fi(LSxBr) li 789,11 gam/ngiy).
18 - 21 tiling tiidi tirong irng li 845, 744, 750 g/ngiy, kit qui niy tuong dirong vdi bd trong 16 thi nghidm 2a vi 2b khi cung cap tu do hdn hpp cd si vi stylo theo ty Id 3:1.
Hau hit cic tic gii nghidn cuu ve nudi sinh trudng vi vd beo bd lai Sind vi bd lai giua lai Smd vdi Brahman diu cho bilt tdc dp ting trpng cua bd lai tdt hon. Doin Trong Tuan vi cs. (2006) cho bilt vd beo bd tiiit gidng lai Sind vi bd lai (LS x Br) cho tdc dp ting trpng aia bd lai Brahman cao hon ding kl so vdi bd lai Sind (889 so vdi 726 g/ngiy). Kit qua ciia tiii nghidm niy trong dilu kidn cho in tu do cd hda thio Od la vi 16 lb) cd xu thi ngupe lai, bd tiii nghidm Vin Tiln Diing (2011) nghidn ciiu nudi bd sinh trong 16 lb (bd lai Brahman) cd tdc dp sinh tnrdng trudng tai Ea Kar vdi khau phan bd sung thuc in hdn tiiap hon ding kl so vdi 16 lb (bd lai Sind). Kit qua hpp cho tiiay bd lai Fj (LS x Dr) tir 15 - 18 tiling tudi sinh tiirdng cua bd lai Brahman cung tiiap hon ding cd tdc dp sinh trudng Ii 680 g/ngiy, trong khi dd kl so vdi cic tic gii khic. Dilu niy cho phep chiing ta tiieo doi trong sin xuat ndng hd chi 450 g/ngiy. Nhu nghi ring khau phan chi cd si cd Id chua dip ling viy ti-ong thi nghiem niy, khi chi can cung cap diy dupe nhu cau dinh dudng cua bd lai kinh tl giiia lai du cd chat luang cao thi tdc dp sinh tnidng cua bd Sind vi Brahman, hay ndi cich khic nlu nudi bd lai tuang duong vdi kit qua ndi trin. Doin Trpng Tuin kinh tl giira lai Sind vi bd hgoai bing khau phan chi vi cs. (2006) dieu tra tdc dp sinh tnidng cua bd lai tai cd hda tiiao, mic dau cho in tdi da vin cho tdc dp sinh duyin hai miln Trung cho bilt bd lai tir sa sinh din tiudng thap, tuy nhiln nlu ip dung khau phln niy vdi 18 thing tudi cd tdc dp smh tnidng chi 11,25 bd lai Sind thi lai cho hidu qua cao. Vi|c tdc dp sinh kg/thing, tiiap han nhilu so vdi thi nghi|m niy kl tiudng cua bd tai hai Id 2a, 2b diu cd kit qui khi cao ca chi cho in 100% cd hda thao. Vu Chi Cuong vi cs., han hoic tuong duong so vdi cic tic gia khic minh 2007 cho bilt sir dung khau phan him lupng protein chiing ring chiing ta hoin toin cd till sir dung khau cao ttr bdt c i vdi ty Id 10%, 20% va 30% dl nudi vd beo phin re tiln bao gdm hdn hpp cd sa vi stylo tiieo ty bd Fg (LS x Br) tai D ^ L ^ thi ting trpng cua bd tii i^ i:3 di nudi bd lai Sind vi lai kinh tl.
NONG NGHIEP VA PHAT TRIEN NONG THON - KY 2 - THANG 2/2012 83
KHOA HQC CdNG NGHfi
B i n g 4: Sinh tnrdng ciia bd thi n g h i | m L6TN
Khdi lupng dau ky (kg) Khdi lupng cudi ky (kg) Tang khdi lupng (kg/thing) Tdc dp sinh trudng (g/ngiy)
Trung binh SE Trung binh
SE Trung binh
SE
la 213,32
1,90 271,65 0,83 19,44 0,54 648,11"
l b 242,52
0,80 293,82 1,43 17,10 0,72 570,00''
2 a 220,61
2,96 289,48 2,60 22,96 0,53 765,22^
2b 235.59
2,75 306,61 6,22 23,67 2.30 789,11"
P<0,05
Cie chdr cii a, b, c, d d cic hing chi sai khic cQa cicgii tif trung binh cdy nghia &mucp<0,05.
Kit qui so sinh bd ciing mdt nhdm nhung nuoi hoin toin thiic in xanh gdm cd hp diu vi c6 h6a d 2 khau phan khic nhau cho thiy cd sir sai khic thio chit lupng eao, mic diu tdc dd sinh truong dang kl vl tdc dp sinh trudng giua hai phuong thuc
nuoi. Bd lai Sind d 16 2a sinh tnrdng 765,22 g/ngiy trong khi dd 16 la chi dat 648,11 g, tuong tu nhu viy bd lai Brahman d 16 2b Ii 789,11 g so vdi 570,00 g d 16 lb (p<0,05). Nhu viy vi|c bd sung cd stylo vao khiu
khOng cao bing cic khiu phin sir dung thiic in hon hpp nhung ch^c chdn sd cd hi|u qui kinh tl cao do chi phi thip. Mit khic mdt nghidn oiu thi tnrong tai Ea Kar nim 2008 cho bilt ngudi budn bd tai Ea Kar sin sing tri gii cao ban cho bd thjt chat lupng cao phan di lim ting tdc dd sinh trudng Idn 117,11 nhung chi nudi dudng bing thuc in xanh (Truong g/ngiy (tuong ling 18%) ddi vdi bd lai Sind vi 219,11 Tan Khanh vi cs., 2011).
g/ngiy (tuong img 38%) ddi vdi bd lai Brahman. Diy li mdt lua chpn cd y nghia ddi cic hd nong din kh6ng cd dieu ki|n di dau tu thim canh cao trong nudi bd thit, thi hp cd thi cung cap diy du khau phan
3. Hi|u qui sur dung thiic in
Sd lieu vl kit qua theo ddi hi|u qui su dung thirc in ciia bd thi nghidm dupe trinh biy dbang5.
Bang 5: Tidu tdn vi chi phi thiic in cho 1 kg ting khdi upng
Chi tidu Cd s i tuoi
Cd stylo tuoi
Tidu tdn VCK thuc an Tidu tdn protein
Chi phi thirc an cho mdi kg tang trpng
Don vi tinh Kg Kg Kg
Gam Ngan dong
Chisd M M M SE M
la 48,68
0,00 8,84"
0,08 954 14,6
lb 56,35
0,00 10,23"
0,13 1104 16,9
2a 34,89 11,63 9.14' 0,16 1169 16,2
2b 34,79 11,60 9,11'
0,14 1165 16,3 P<0,05
Trir Id lb cd tidu tdn thiic in cho 1 kg ting khdi lupng khi cao (10,23 kg VCK/kg ting khdi lupng), cic Id cdn lai cd gii tri tuong duong (8,84, 9,14 vi 9,11) vdi p<0,05. Dinh Vin Tuyln vi cs., 2007 cho bilt vd beo bd bing cic khiu phin bing thuc in hdn hpp 15,86% protein se cho tiiu tdn chit khd cho mdt kg ting khdi lupng chi bi 3,9 din 4,5 kg VCK. Tuy nhiln cic tic gia khic: Pham Kim Cuang vi cs., 2001 cho kit qua Ii 6,3 - 7,9 kg CK/1 kg ting ti-png, Vu Chi Cuong vi cs., 2001 cho kit qua tir 6,2 - 15,9 kg VCK/1 kg ting trpng; trong tidu c h u ^ NRC ylu cdu dat 7,1 - 10,2 kg VCK/kg ting ti-png. Nhu viy, chi tieu tidu tdn tinic in trong thi nghi|m niy hai cao, tuy nhidn dilu dang luu y li tat ca lupng vat chit khd trong thi nghidm diu tir cd xanh vdi gii re va hau hit ndng din diu ed till san xuat, vi viy gii thinh thiic
in dl sin xuit 1 kg ting trpng rat thap, tir 14,6 -16,9 ngin ddng.
IV. K ^ LUAN VAKBV NGHj
l.Kltluin
Nudi bd lai Sind 18 - 21 thing hidi bing each cho in tu do (adlibituni) cd hda thao chat lupng cao cd thi cho ting trpng khi cao (din 668,11 gam/con/ngay) vi chi phi thiic in thdp (14,6 ngan ddng/1 kg ting trpng). Bd Fi(LS x Br) nudi bkg cich chi cho in tu do cd hda thao cho ting trong thdp va thap hon bd lai Sind (570 g/con/ngiy so vdi 648,11 g/con/ngay) chi phi thuc in cao (16,9 ngan ddng/1 kg ting ti-png), nhung khi cho in tii do hon hpp cd dau vi hda thao thi cd ting trpng cao hon bo lai Sind.
KHOA HOC CdNG NGHfi
Bd sung cd Stylo 184 vio khau phan cd s i trong khau phan ddn kha ning ting trpng vi hidu theo ty Id 25% v i eung cap tir do cho bd lim tSng qua kinh t l cua bd lai Brahman tai Dik Lik. Bio cio lupng i n vio ciia bd c i hai nhdm: lai Sind ting trinh biy tai hdi nghi khoa hpc Vidn Chin nuoi 2007.
22%, bd lai Fi(LSx Branman) 23% so vdi bd chi in 3. Pham Kim Cuong, Vu Chi Cuang, Vti Vin Noi, tu d e e d hda thao. Dinh Van Tuyln, Nguydn Thanh Trung, 2001.
Bd sung cd Stylo 184 vio khau phan cd s i theo Nghidn ciiu sir dung ram lua trong khau phan bd ty Id 25% lim ting tdc dp sinh trudng cua bd ca 2 tint. Cic bio cio khoa hpc cua d l tii nghidn cim nhdm Idn k h i cao (lai Sind ting 18% vi Fi(LSx khoa hpc 08-05. Trang 174 - 187.
Branman) ting 38%. 4. Vin Tiln Dung, 2011. Nghidn ciru quy ti-inh Ndng din hoin toin cd t h i nu6i sinh trudng nu6i duong bd tiijt chat lupng giai doan 6-18 thing bd lai Sind v i bd lai kinh t l Oai Sind x Brahman) tudi tai huydn Ea Kar, tinh Dik Lik.
bing cich sir dung khau phan cd bd sung cd Stylo 5. Dinh Vin Tuyen, Nguydn Thinh Nam, Phan-.
184 tiieo ty Id 25% m i khong can bd sung thiic in Hung Cudng, Nguydn Thidn Trudng Giang, 2007. So hdn hop vin cd the cho sinh tnidng k h i tdt, hidu sinh khi ning ting ti-png vi cho tiiit khi vd bdo bd qua sir dung thue i n cao, ehi phi thire i n cho 1 kg tiiuan Brahman vi bd Lai Sind nudi tai Tuydn Quang.
ting trpng tiiap. Bio cio khoa hpc Vidn Chin nuoi nim 2007.
2. Bi nghi 6. Vidn Chin nuoi, 2001. Thinh phan gii tri dinh Cdng nhin kit qua nghidn cuu v i cho img dung duong gia sue, gia cam Viet Nam. Nxb Nong nghidp.
trong sin xuat ndng hd. 7. Truong Tan Khanh, Werner Stiir, Nguyen Van Tilp tuc nghidn cuu c i c khau phan hpp ly, sir Ha and Alan Duncan, 2010. Assessment of cattle dung thue i n sin ed, re tien d l nudi bd d cic giai marketing in Ea Kar district, Daklak, Vietnam in doan khic nhau, cung cap thdm nhilu lira chpn 2008. Website: http://mahider.ilri.org/handle/
cho ndng din d l i p dung tiiy theo dilu kidn sin 10568/4748.
xuat cua hp. 8. Truong Tan Khanh, Nguyen Ngoc Anh, TAI LEU THAM KHAO Werner Stiir, 2011. Smallholder cattie fattening in 1. Vu Chi Cuong, Vu Vin Ndi, Pham Kim Cuong, Vietnam. Technical Advisory fo IFAD.
Nguydn Thinh Trung, Dinh Vin Tuyln, Doin Thi 9. Werner W. Stiir and Peter M. Home, 2000.
Khang, 2001. Nghidn eiiu sir dung ri mat trong khau Developing forage technologies with smallholder phan bd thit Cic bio cio khoa hpc cua d l tii nghidn farmers. How to grow, manage and use forages,
ciru khoa hpc 08^5. Trang 162 - 171. 10. Preston, T. R., WilUs, M. B. and Elias, A., 2. Vu Chi Cuong, Pham Kim Cuong, Nguydn 1967., Intensive Beef production from Sugar Cane.
Thinh Trung, Pham T h i Hud, 2007. Anh hudng cua 11. NRC 1984. The nutiient requirements of beef vide thay thi protein thoit qua (by-pass protein) cattie. Washington DC.
EFFECT OF SUPPLEMENTATION OF FRESH STYLO IN GRASS DIET ON GROWTH RATE AND FEED CONVERSION RATIO OF GROWING BEEF CATFLE
Truong Tan Khanh Summary
The study was designed to evaluate the effect of feeding ad libibim the mbdng of fresh stylol84 and Panicum maximum grass diet (with ratio of 1:3) for growing cattie of sind breed and F1(LS x Br). The results of study showed: 1) Supplementing stylo 184 to the diet with only fresh grass improved the feed intake 22 - 23% compared to tiie diet only grasses; 2) the body weight gain of Sind cattle that fed ad libibim only grass was quite high (648.11 gram/day) and significant higher than F,(Br x LS) with the same diet, while feeding cattle by mbcing grass and legume with ratio 3:1 the body weight gain of crossbred Fi(Br x LS) was higher; 3) the body weight gain of both cattle groups in the ti-eabnent of ad libitum mbdng of stylo and grass was much higher than those if feeding only grass (765 gram/day/head with Sind cattle and 789 gram/head/day witii Fi(Br x LS); 4) the cost for producing 1 kg of body weight gain of growing cattle was low (VND 14,000 - VND 16,900) compared to ifs price in the market (VND 35,000 - VND 40,000).
Key worlds: Effect, stylo, grass, growing cattie, Sind cross-bred F1(LSx Br).
Ngudi phan bi|n: PGS. TS. Mai Vin Sinh
