KHOA H9C COMO HttWI
AlMH HUAlMB T A I M G MLTC CHO A M TtUUtiC K H I P H d l EldlVG OtX IVAIMG S U A T S H V l l l i A M CUA
LQ1M I M A I L A I V D R A C E
Nguyfn Nhyt Xuin Dung', Pham Th) Hdng Difp", Lim HOu Manh>, Vft Ai Quic"
T 6 M T A T
Nghien Cliu niy nhim muc U6u dinh gIS ilnh huftng cila vifc Ung miic an cho Ipn nil Bau cai sua tu 2,5 kg (DC) l«n 3 kg (NT,) vi 3,5 kg (NT,,) ttuiSc khi phii gidng df n nSng suit ainh sin ciia Ion nii Landrace. Thi nghifm dupc Hfn hinh uen 18 Ipn nil Landrace ft liia df Uiii 4 v4 dupc Uiift kf ttieo klfu hoin toin ngiu nhiin vfti 3 nghifm tiiiic, Ijp lal 6 lin, m6l don v) thi nghifm 14 mft Ipn nil. Cic chi titu nghiSn cilu chinh bao gim si con so stah, khdi luong so sinh, sd con cai sUa vi khil lupng cai sda. Kf 1 qui nghlSn cuu cho Uiiy cic chi U6u ning suit cua Ipn con ti-tn nii cho Sn 3 vi 3,5 kg cd cil Ufn so vfti in 2,5 kg. Sd con so stah/d cao nhit ft NT„ (12,83) kf dft 14 NT, (10,33) so vfti DC (9,0) (P-0,01). Khdi lupng so sinh/d cao nhit NT„ (21,18 kg/d), kf dd 14 NT, (17,69 kg) so v6l DC (13,77 kg/d) (P<0,01). Sd con 21 ngiy tudi ciia cao nhit NT„ (11,0), kf dft li NT, (9,33) so vOi DC (8,0) (P<0,01). Khdi lupng loin d liic 21 ngay Uidl cao nhit NT,,s (68,78 kg/d) kf d6 14 NT, (57,02 kg/i) so vfti DC (42,83 kg/d) (P<0,01). Tang miic an cho Ipn nii sau cai siia Ipn con til 2,5 Itn 3,5 kg da cii tif n dupc sd con vi khdi lupng so sinh, liic 21 ngiy tudi vi sau cai sua. Df ning cao nang suit sinh sin ciia Ipn nii, ting miic an ciia Ipn nil sau cai 80a Ipn con 14 bifn phip ntn dupc ip dyng Uong sin xuit
TitVhiia: Um nil, kich Ungsinh sin, Ulngmtican, trudc phdl gling.
LBiTViiNet
Vfti sy phit trifn nhanh vf din sd v i kmh tf, ft nuftc ta cft su gia ting nhu ciu vf thit v4 siia, dac bift 14 thit v4 c4c sin phim chf bifn tir thjt Ipn. Sin lupng thit Ipn phy thuftc vip kha ning s i n xuit ciia Ipn nii (sd ipn cpn cai siia/n4i/nam). Df tdi uu hfta siic sin xuat, nhung kifn thiic vf kha nang sinh s i n ciia cic ca ttif ttong din cQng nhu cic yfu td inh huftng dfn siic san xuit ctia Ipn nhu: gidng, difu kifn khi hau thdi tift, chudng trai, chit lupng thiic an, cich t i c dong thuc i n timg giai doan phit trifn, ky thuat chim sftc nufti duftng, Ipn nii cin dupc quan tim.
Trong ttiuc tf, cic n h i chan nufti Ipn nii smh s i n da v i dang iing dyng cic bifn ph4p ky thuat ttong chan nufti nhung dfti khi chua phii hpp hoac phii hpp ft miic da chua ding kf, vi thf nang suit sinh sin ttong chin nuoi Ipn nii cftn ban chf, sd Ipn nii bi Ipai nhieu do ning suit smh sin thip do chua cung c i p diy du duftng chit nhu ning lupng v i prptein (Nguyfn Sinh, 2009). Kich ttiich ting sinh s i n l i bifn phip tang so lupng thiic i n , bao gdm Hng nang lupng v4 proteui cho Ipn mftt thfti gian ngin truftc khi phdi giong nhim df ting sft tiling ryng vi Uif cft
Bp mon Chan nuoi, Khoa Nong nghifp & SHUD, Truftng Dai hpc Can Tho
^ Tmong Dai hpc Tri Vinh
' Bft mon Thli y, Khoa Nong nghifp & SHUD, Dai Hpc
dupc nhi^u con trong mOt liia de (Naber, 1971;
Wachholz et al., 1971). Bi^n ph6p nAy da dupc Sp dyng thAnh cfing Irfen ciru vk trtn Ipn. McDonald (1994) cho bi^t kich thich tdng sinh sdn IAm t ^ so con tFong Ilia d^. Di^u nAy cung dugc khAng dinh boi Leo den Hartog vA van Kempen (1981); nh6m tAc gia chi ra rAng tAng muc An vAo hay tAng nAng lugng trvtbc khi phdi dA gia tAng nAng suAt sinh san cua Igo nAi. Do d6 tAng cu6ng dinh dufing cho Ipn nai sau Uii cai sua Ipn con IA d^ giiip Ipn nAi phuc h6i ca th^ sau thfii gian nufii con trong giai d o ^ tnific khi dpng due, ngoAi ra cfin tAng kha nAng cua bu6ng tning, san suA ra nhi^u tning cho chu ky dfing dye k^ ti^p nhAm tSng sfi Ipn con s a sinh tr$n 6. Myc tidu cua d^ tai nhilm dAnh giA Anh huong ctia vi$c tAng muc An ciia Ipn n^
sau cai sua d^n nAng suAt sinh san cua Ipn nai Landrace t ^ co so chAn nufii Phufic Thp, Vinh Long.
L VAT U(U VA PHUONG PHAP n e ^ CUU 1. Dja di^m, dOng vAt vA chudng t r ^ tiii nghidm Thi nghidm dupc thuc hi^n tai trai chAn nufii Ign gi6ng Phufic Thp, Vmh Long trong khoang thoi gian 5 thAng.
Thi nghidm dupc ti^n hanh trfin 18 Ipn nAi sinh san gidng Landrace a liia de thii tu, cfi khdi lugn?
tuong duong khoAng 300 kg/con. Dfi hao mon colh^
m? cua Ipn khoang 20-25%. Lpn dupc chpn lam thi nghidm cfi thfii gian chfi phfii trung binh la 10 ngay
58 N C N G NGHlfP VA PHAT TR[rM f 16' "2012
KHOA HPC C 6 N 0 NOHt
(8-12 ngay) d^ dinh dufing cao tAc dfing lfin s\f ryng tning. Um nAi thi nghidm dupc phdi gifing bfii dye Landrace d^ san xuAt lpn gidng thuAn Landrace.
TAt ca lpn nAi khfi chfif phdi dupc nufii trong 18 chudng nufii cA th^, cfi vAch ngAn b^ng thanh sAt, mAng An IAm bAng t h i ^ ciing, nufic udng cung cAp bang niim ufing tu dOng, chudng cfi qu^t thfing gifi d^ tao do thfing thoAng trong chudng nufii.
2. Thiic An vA miic An thi nghidm
Trai su dyng thiic An dAm dAc l o ^ 18B, do Cfing ty Proconco cung cAp, sau dfi phdi trdn thfim vbi cAc lo^ thiic An cung cAp nAng lupng nhu tAm, bAp vA c ^ . Tat ca cAc lpn nAi nufii thi nghidm 6 giai do^n trufie phdi gidng deu sii dyng mfit khAu phAn An.
Thanh phdn hfia hpc vA giA tri dinh duOiig cua khAu phan lpn nai dupc trinh bAy qua bAng 1.
BAng 1. ThAnh phAn hfia hpc vA giA tri dinh dufing ciia thiic An nufii lpn till n f ^ f t n Thinh phin hda hpc
vi gii tri dinh duftng AmtiW) Tio 00 Protein di6 (X) BeottiftW Xotiungtinh (%) XothftQO Chift chit khftng dam Phdtpho 00 Canxi 00 NSng lupng trao ddi, ME (kcalAg thiic an)
Trang ttiii cho an
12,16 7,09 14,97 7,80 15,14 3,50 54,46 0,72 1,06 2.950
Trang thii khO hoin toin
8,07
-
17,04 8,88- 17,24 3,98 62,00 0,82 1,21 3.360 Giai doan 7-15 ngay trufie khi phdi lpn dupc cho an theo 3 nghidm thiic khac nhau: NT ddi chiing (NTOC): 2,5 kg su dyng sd lupng thuc An cua t r ^ dang dimg cho nAi khfi cha phdi; NT2 (NTang): cung c ^ 3 kg thiic An/ngay; NTS (NT3.5Vg): cung cap 3,5 kg/ngay. Giai doan giua ky 1 va II, tAt ca cAc lpn nAi dupc cho An vfii sd lupng thiic An tuong ling IA 2,5 vA 3 kg/ngay.
3. ChAm sfic nufii dirfing
Lpn nAi sau khi tach con dupc chuyin v^ khu chfi phdi, dupc tiem 1 lilu ADE, chpn lpn theo tifiu chuan liia, gidng vA t h i trang cua lpn nAi, sau dfi bd tri vAo lfi thi nghiem cho An theo 3 loai dinh miic IA 2,5 kg, 3 kg vA 3,5 kg/ngAy, lap philu theo doi rilng cho lpn timg nAi v l lupng thiic An hAng ngAy, kem 1^
lich va nAng suat sinh san, tinh hinh sue khoe. Lpn
N 6 N G NGHlfP VA PHAT TRIEN NONG T H 6 N - KY 1 - THANG 9/2012
dupc tilm phfing dAy du cAc l o ^ v^cxin theo qui trinh chAn nufii lpn nAi cua c a so' nghiin cihi. Trufie khi d^ dy kiln 7 ngAy, lpn nAi dupc tAm riia s^ch sfi bAng xA phfing, tAy ndi vA ngo^i k^ sinh trimg vA dupc chuyin din chudng lpn nAi dh dA sAt trimg.
Tnrfic khi nAi dfe dy kiln 3 ngAy giAm lupng thiic An/ngAy xudng cfin khoAng 1,5 kg/ngAy. Die dl, lpn nAi khfing dupc cho An d l d l phfing vilm vii do cAng sQa sau dl.
4. CAc chi tilu tiieo dfii
• Thfii gian mang thai (ngAy): tinh tir ngAy Ipn nAi dupc phdi gidng thAnh cfing din ngAy nAi de con Ilia dfi - NgAy lpn nAi sinh con - ngAy lpn nAi phdi gidng.
- Ti lfi dAu thai (%) - (Sd nAi dAu tiiai/ sd nAi dupc phdi) * 100.
- Sd con sinh ra (con/d) - IA tdng sd lpn con de ra bao gdm lpn cfin sdng vA lpn chit, dupc tinh khi lpn m? de xong con cudi cimg.
- Sd con so sinh d l nufii (con/6): IA sd con cfin sdng d l l^i nufii cua d de, nhung con cfi khdi lupng nhfi hon 0,8 kg, bj dj tAt, khfing dii siic khoe bi loai bo, nhiing con con lgi chinh IA sd con d l nufii.
- Khdi lupng sa sinh (kg /fi): la khdi lupng cua tdng sd lpn con sa sinh dupc de ra.
- Khdi lupng s a sinh (kg/con): khdi lupng trung binh cua 1 lpn con so sinh do lpn nAi de ra.
- Khdi lupng toan d 21 ngAy tudi (kg/d): IA khdi lupng toan d lpn nuoi sdng din 21 ngay tudi.
- Sd con 21 ngAy tudi (con/d): IA sd lpn cfin sdng Clia d tinh den 21 ngAy tudi.
- Sd lpn con cai sira (con/d): IA tdng sd lpn con cfin sdng cua d tinh din thfii dilm cai sua.
- Khdi lupng cai sua (kg/d): khdi lupng toAn d lpn con liic cai siia.
- Khdi lupng lpn con cai siia (kg/con): IA trung binh khdi lupng lpn con cai sira ciia d bAng khdi lupng lpn con cai siia toan d chia cho sd con cai siia.
- Tl 1| nufii sdng din cai siia: IA ti 1| lpn con cfin sdng cho din khi cai siia so vfii sd con so sinh d l nufii.
5. PhAn tich hfia hpc
Mau thiic An thi nghifim cua Ion nAi dupc tiln hAnh phan tich hAm lupng vAt chat kho, protein thfi, canxi, phdt pho theo qui trinh tifiu chuAn ciia AOAC (1995).
59
KHOA H9C C 6 M 0
6. BS Iri thi nghifm v i phuong phip xi:lis6 Ufu Thi nghifm dugc h i tri theo thi thiJK hoin toin ngSu nhi«n v « 3 nghifm thiic, hrong umg v6i 3 miic an l i 2,5 kg (NTOC), 3 kg (NT,k,) v i 3,5 kg/ngiy (NTjsk,), Ijp ¥ 6 iSn, c4 18 don vi thi nghifm, m6l don vi thi nghifm l i mft !(m nii kh6 chft phfii.
Sd hfu duoc phin tich phuong sai, khi phfp thii F sai khic c6 f nghia, Ufn hinh so sinh cfp theo phfp thii Tukey (Minitabl3.2).
KKfTQUAvATHAOUltN
1. S6 lupng duOng chilt v i ning luong i n vio S6 luong duOng chit v i ning luong i n vio ciia l(m thi nghifm duoc trmh biy qua bing 2. Do vifc ting s6 luong thiic i n ndn s6 lupng duOng chit v i ning lupng in vio tang, lpn nhfn dupc him lupng vft chit khd i n vio 6 cic nghifm thiic d6i chiing, NTisij v i NTjj, lin lupt li 2,2, 2,64 v i 3,07 kg. S6 lupng protein in vio l i 0,426, 0,511 v i 0,596 kg/ngiy vi ME li 7,38,8,86 v i 10,33 kcal/ngiy
Bing 2. S6 duOng chit v i ning lupng i n vio dia lpn
d i a c i c miic i n lfn chi tifiu sinh
So lupng an vio, k g / n g i y Vat chat kho Protein th6 Canxi Phdtpho ME, kcai/ngay
D6i chiing ( N T „ J
2,20 0,426 0,030 0,021 7,38
NT,^, 2,64 0,511 0,036 0,025 8,86
NT..S,.
3,07 0,596 0,042 0,029 10,33 2. Anh hudng miic in dfn ning suit shih sin trfn Ipn nii vi lpn con
Anh huong ciia miic in dfn ning suit smh sin cila Ion nai Landrace dupc trinh biy qua bing 3.
Cic miic cho an khic nhau khong anh huong khic bift dfn ty If dau thai va ty If de cCia din nii thi nghifm, tat ca deu dat 100*. Miic in cung khong anh huong dfn s6 ngiy mang thai, trung binh li 115 ngiy (P=0,50). Tuy nhidn, ting miic in tnjfc khi lpn nii dupc phoi giong di nit ngin so ngiy den ngay lfn giong lai, 6 ngiy o NTDC, trong khi a NTj,^ vi NT„kj Mn lupt la 5,53 vi 5 ngiy (P- 0,03 con/6).
Them vao do ting miic 3n truoc khi ph6i c6 di ting sf con so sinh/6 (P.0,03), NTDC c6 9; NTji, cd 10,33 con/6 vi NT„ij c6 12,83 con/6. Hon thf niia, ting miic in cung lim ting so lpn con de nuoi trong mot 6 (P.0,01) lin luot li 8 con (NTDC), 9,67 con (NTjig) vi 11,83 con {NT351,,) nhu thf cung lim ting so lpn con 21 ngay tuoi (P . 0,01), lan luot li 8, 9,33 vi 11 con/6 ddi vol NTDC, NTsk, vi NT, i^.
• (ta e u a l n n i l v i lpn c o n
U l J ^ k . llMl,..
GlaldoBlMlnilvtuil ' " " 1 ,r«'S S6con«atiah/6
T l l f i l S n g 2 4 g l » , » Kh/il Iupng ao sInhM (kg) Khdi luong HO sinh/con (kg)
9,00»
8,00- 90,19 13,77»
1,72 103*
9,e7»
94,04 17,69*
I «
mr
llM 9iSi 21,16- 1,80
P^^H 'TOlwr
K!B 1 3JS
ftffiS
0,60'M
21nciivtu(!l « ^ ^ S^ con 21 ngiy/tf
Ti 1$ nudi fldng, % Khdi luons/d (kl) Khdi lirpng/con Oui) Cai sfla Sd con cai tOaii T i l t nudi sdng,*
Khdi luonif/d (kg) Khdi luong/con OlB) Sd ngay cai sira (ngiy) Sd ngay mang thai (ngay)
8,00>
100,0 4233^
5,33 93f 96,80 5 7 ^ 6,12
IIJOO-
nx
S8.78' S,26
8.0»
100 47.33 6.05 24.17 115,1
933^
96.8 61,95 6,59 23,50 115.00
u^'-\
9 3 J ' "
73.43 6,68 23,67 115,00
j i B ^ ^ H
i ^ ^ l o!M^H
MsrwjTj
tJSflfl oji \i»\
e,s^H
'•'''dc gii tri trung binh trong cung.
chu sd a mu khic nhau thi sat khac & mac (P<6,0^
theo phip thd Tukey
Ting miic an truoc khi phfi d i lim ting khoi lupng so sinh/6 (P-0,01), t h i p nhit b NTDC voi 13,77 kg/6: kf dfn la NTj,. v6i 17,69 kg/6 vi NT,s, v6i 21,19 kg/6. Tuong tu nhu vJy, khfi lupng lpn con cai siia thip nhit b NTDC (42,84 kg/6), kf den la NTji. vdi 57,02 kg/6 v i cao nhit d N T j ^ , voi 68,78 kg (P-0,01). Tuy nhifn, miic i n khdng inh huong dfn khfi lupng so smh/con, lin lupt l i 1,72 kg/con (NTBC), 1,83 kg/con (NTji,) v i 1,80 kg/con (NT,.5».).
Do so lupng lpn con so sinh/6 ting nfn so con cai sira/6 cung cao hon so voi NTDC (P-^.Ol)..!""
lupt l i 8 (NTDC), 9,33 (NT31,) v i 11 con/6 (NTj,i,) cho nfn kh6i lupng lpn con cai stra/6 ciia cic NT tang miic i n cOng cao hon so vdi NTDC, lan lu?tl>
(42,84 kg/6), 57,02 k g / 6 (NTj^^) v i 68,78 kg/"
(NT3.S1,, P.0,01). T i n g miic i n trmSc khi phoi ciBg lim ting khoi lupng lpn con cai sira (P<0,01), lan W l i 5,33 kg/con (NTBC), 6,12 kg/con (NTj»j) vi 6,26 kg/con ( N T i s J .
60 N6NG NGHI|P VA PHAT Tr'^" " * " = • " - i ' • 0/2012
KHOA HPC C 6 M 0 NOHt
Tl l | nufii sdng sau 24 gifir cao nhAt b NTakj IA 94,04%, k l din NTss^ IA 92,91% vA thAp nhAt lA NTOC 90,19%, tuy nhiin sv khAc b i | t khfing cfi y nghia thdng k l (P-0,17). TAng mOrc An cQng khfing anh huong din ti 1| nufii sdng tiic 21 ngAy tudi (P-0,75) hay cai siia cua lpn con CP-0.17). Dilu nAy
\k hpp ly, do sau khi heo con dupc d l ra, s^ sfing cfin Clia chiing phy thufic rAt lfin vAo sy chAm sfic nufii dufing cua trgi.
Qua k i t qua nghiin ciiu cho thAy cho nAi An miic An fi 3 kg tdt hon tifiu chuAn dang su dung ciia tr^ IA 2,5 kg va miic An 3,5 kg cAi tiln rfi rfit nAng suAt sinh san cua lpn nAi. Cfi nhilu y l u td Anh hufing din sd con so sinh trin d nhu gidng, si; quAn IjJ^ lpn hAu bj, thfii gian cho sua, bfinh, stress hay b dijc gidng. Ti lfi dau thai vA ti l | de diu dgt 100%, dilu nAy cfi t h i giAi thich IA dAn lpn nAi thi nghilm diu khfie m ^ h , dang 0 Ilia de thii tu, dAy IA giai d o ^ lpn nAi co bAn di vAo thoa ky san xuAt dn dinh nhAt TAng miic An sau khi cai sua lpn con khfing Anh hufing din sd ngAy mang thai; theo Lfi Dinh Phiing (2009), sd ngAy mang thai cua lpn nAi lai Fi (Landrace X Yorkshire) IA 114, 31 ngay ± 1,51, ngAn nhAt IA 110 ngay vA dAi nhAt IA 120 ngay, trong khi sfi lifiu ghi nhan dupc tirong thi nghilm la 115 ngAy vA khfing cfi su khAc bifit giiia cAc nghifim thirc. Nhu vAy ngAy mang thai chju anh hufing ciia dilu kiln sinh ly npi tilt ciia cA t h i hon IA tac dfing Clia thiic An vi thfii gian tAc dfing thiic An lfin lpn nAi thi nghi|m tnrfic khi phdi gidng tuong ddi ngAn, chi 10 ngAy.
TAng miic An sau khi cai siia lpn con IA mdt trong nhiing bifin phAp nhAm tAng sd con so sinh/liia de. 6 ckc trang trai chAn nufii lpn gidng, sau khi cai sua lpn con, Ipn nAi hi tilt giam rAt dAng k l sd lupng diiic an An vAo d l ngimg ngay lAp tiic sy san xuAt sQa, hgu qua IA lpn nAi bj giam t h i trpng vA giAm mfi CO thi, dilu nAy cd t h i anh huong Iln sd tning rung ciia lpn nAi. Ti lfi tning n^ng bj giam khi nAi khfing diroc cung cAp day dii thiic An (The Merck, 2012).
Nfin cAc lpn nAi thi nghifim dupc nhAn c h l dp dinh dufing cao la 3 va 3,5 kg, cfi con lpn con sinh ra ti-fin 6 CO tAng so vfii ddi chiing. Sd con sinh ra trfin 6 ciia ' cac NT dupc tAng lupng An vAo, cfi t h i giAi thich do ' tAng so tning rung.
Theo Pharazyn vA cAc cfing su (1991), sir thay ddi h ^ lupng progesterol sau khi rung tning la ylu f to dl xac djnh sd phoi con sdng, cfi lfi do thay ddi mfii tnrang cua dng dAn tning hoAc tdc dfi di chuyin
Clia phfii. Ylu td IAm tAng sd tning ryng IA do tAng nAng lupng vA protein An vAo.
Theo Jones vA Maxwell (1974), Dyck and Strain (1979). Armsti-ong vA Britt (1987), vific hgn c h l nghilm trpng sd lupng thiic An, giAm nAng lupng vA protein An vAo IAm chAm si; dfing dye lpn nAi.
Armstrong vA Britt (1987) bAo cAo IA nAng Iupng An vAo bj h^n chl, dAn din chAm ddng dye trfin lpn cAi to do hAm Iupng LH bj giAm do sv thay ddi bAi tilt GnRH ciia vung dufii ddi. Rozeboom vA cAc cOng su (1993) cho rAng nAng lupng An vAo bj hgn c h l IAm tAng hAm lupng progesterol, bAng cAch iic c h l giai phfing gonadotrophin IA phuong ti|n d l din din chAm dfing dye trin nAi to; ngupc lgi trfin lpn nAi rg thfii gian lfin gidng lgi bi kio dAi do ndng dfi progesterol rAt thAp. Mfit sd nghiin ciiu cho thiy tAng miic An 10 din 15 ngAy trufie khi phdi dA IAm tAng sd tning ryng, nhung n l u tilp tuc c h l dfi dinh dufing cao sau khi phdi IAm giam sd phfii cfin sdng (Leo den Hartog vA van Kempen, 1980), anh huong din lpn nAi de Itia dau sau cai sua Gindal et al., 1996), nhung khfing xAy ra trfin lpn de liia rg CToplis et al., 1983; Dyck vA Cole, 1986; Varley va Prime, 1993). Vific giAm sd lupng phfii cfin sdng trin nAi to do giAm miic progesterol. Theo Ashworth vA cAc cfing su (1999) tAng cufing c h l dfi dinh dufing cho nAi to tnrfic khi phdi sfi IAm tAng ti lfi phfii sdng, vi t h i IAm tAng sd lpn con so sinh. Trong bifin hpi ciia Kongsted (2005), lpn nAi ra dupc nufii duong cfi c h l dfi nAng lupng thap IAm giam sd con so sinh va co t h i m? bj hao mfin nhilu hon so vfii nAng lupng cao.
Sau khi phdi tAt cA lpn nAi dupc cho an 2,5 kg a giai dogn chira k^ mfit vA 3 kg giai dogn chua kJ 2.
Thoi gian ciia sy thay ddi miic An vAo IA khoang thoi gian ngay lAp tiic sau khi phdi, dAy con dupc gpi la thfii dilm nhgy cAm anh huong din ti lfi sdng ciia phfii Oindal et al., 1996; Pharazyn et al., 1991;
Foxcroft, 1997), cfin gpi IA thfii dilm "ciia sd" sau khi rung tning vi n l u thilu progesterol sfi tgo ra su k i t hpp khfing ddng bfi giiia phfii vA tii cung, vi thi anh huong din ti l | sdng ciia phoi. Cfi mpt sd dii kifin cho rAng cAc miic dd xteroit Anh huong din sy ddng bp ciia phfii va tii cung vA nhu t h i su sdng cua phfii dupc bao vfi thfing qua hoat dfing cua dng dAn tning (Mburu et al., 1998) vA mfii tiirfing tii cung (Roberts vaBazer,1988).
Kit qua v l nAng su^t sinh san cua lpn nai tuong tif vbi bAo cAo ciia Leo den Hartog vA van der Steen
I N O N G NGHllP VA PHAT TRIEN N 6 N G THON - KV 1 - THANG 9/2012 61
KHOA HpC C6NO M O H J
(1981)-, d6l vdi lpn nil r?, chf df dinh dudng cao nfn dupc i p dyng cho lpn nil sau khi cai sfla df cil Ufn difm thf h-?ng co thf v i nit ngin thdi glan df ng dijc.
Kft qui thi nghifm cho thiy vifc tSng miic i n cho lpn nii trong mft thdi gian ngin sau khi cai siia lpn con til 2,5 lfn 3 v i 3,5 kg tmdc khi phfi da lim tang sf lpn con sinh ra, tang kh6i lupng so sinh/6, tang sf con v i khfi lupng liic 21 ngiy tu6i/6 v i cflng nhu ting sf con v i kh6i lupng lpn cai s(ta/6 trong difu kifn chin nuf 1 d dfng hing sf ng Cthl Long.
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EFFECTS OF HIGH PLAN NUTRmON BEFORE MATING ON REPRODUCTIVITY PERFORMANCE OF LANDRACE SOWS
Nguyen Nhut Xuan Dung, Pham Tlii Hong Diep, Luu Huu Manh and Vo Ai Quae Summary
The objective of this study was to evaluate an effect of the feeding intakes at levels of 2.5 kg (control), 3 kg (treatment 1) and 3,5 kg (treatment 2) on reproductive performance of Landrace sows. Eighteen Landrace sows of the 4* parity were allocated according to a completely randomized design with 6 replicates. Results indicated that the high feed intake levels affected total number piglets bom/litter as compared to the control (P-0.01). At bora, piglet birth weight/litter of Ueatments 2 (21.18 kg/litter), 1 (17.69 kg/litter) were higher than Uie confrol (13.77 kg/litter) (P-0.01). At 21 days, piglet numbers of the Ueatment 2 and 1 were higher than that of the conUol (11.0, 9.33 and 8.0 piglets/litter, respectively, P=0.01) and the piglet weightAtter was enhanced as compared to the conUol (68.78, 57.02 and 42.83 kg/litter, respectively, P<0.01). High plane of nutrition before mating improved sow reproductive performance.
Keywords: Mating, flusing, high feeding intake, sows.
Ngudi phin bifn: PGS.TS. Le Dtoh Phimg Ngiy nhJn bii; 4/5/2012
Ngiy thdng qua phin bifn: 5/9/2012 Ngiy duyft ding: 10/9/2012
N 6 N G NGHlfP VA PHAT TRIEN NONG T H 6 N - KY 1 - THANG 9/2012 63
