曾幾何時,優質魚粉價格低至500美元/英噸(1英噸≈1.02噸,譯者注)左右,且幾乎所有人都在使用魚粉。家禽日糧中總是含有5%的魚粉,而在肉雞早期日糧及蛋雞日糧的魚粉添加量可高達10%。大多數營養師不願再提高家禽飼料中魚粉添加量的原因並不在於魚粉的成本,而是在於魚粉中魚油含量。
日糧配方中添加10%的油脂和10%的魚粉(飼料級魚粉中的魚油含量通常在1%以上),這(zhe)是(shi)不(bu)至(zhi)於(yu)導(dao)致(zhi)家(jia)禽(qin)拒(ju)食(shi)或(huo)產(chan)魚(yu)腥(xing)味(wei)蛋(dan)的(de)最(zui)大(da)允(yun)許(xu)使(shi)用(yong)量(liang)。實(shi)際(ji)上(shang),與(yu)其(qi)說(shuo)是(shi)飼(si)料(liao)的(de)魚(yu)腥(xing)味(wei)導(dao)致(zhi)雞(ji)隻(zhi)拒(ju)食(shi),倒(dao)不(bu)如(ru)說(shuo)是(shi)魚(yu)油(you)變(bian)質(zhi)太(tai)快(kuai)導(dao)致(zhi)的(de)——變bian質zhi的de魚yu油you散san發fa出chu的de氣qi味wei真zhen的de令ling人ren作zuo嘔ou。不bu過guo,話hua又you說shuo回hui來lai了le,魚yu粉fen確que實shi是shi家jia禽qin日ri糧liang中zhong不bu可ke或huo缺que的de一yi種zhong成cheng分fen,大da多duo數shu營ying養yang學xue家jia聲sheng稱cheng魚yu粉fen中zhong含han有you“X因子”或者說是不明營養素,或許他們的觀點有一定道理,但是目前尚未找到足夠的證據來證明。
為何魚粉如此受歡迎?
魚yu粉fen之zhi所suo以yi如ru此ci受shou歡huan迎ying,是shi因yin為wei魚yu粉fen的de性xing價jia比bi較jiao高gao。目mu前qian它ta的de價jia格ge與yu全quan脂zhi大da豆dou接jie近jin,但dan其qi蛋dan白bai質zhi含han量liang幾ji乎hu是shi大da豆dou的de兩liang倍bei,且qie氨an基ji酸suan組zu成cheng更geng佳jia,此ci外wai還hai可ke提ti高gao家jia禽qin采cai食shi量liang,這zhe在zai其qi他ta原yuan料liao簡jian直zhi是shi聞wen所suo未wei聞wen。無wu論lun出chu於yu什shen麼me原yuan因yin,當dang家jia禽qin采cai食shi量liang成cheng問wen題ti時shi,營ying養yang學xue家jia總zong是shi考kao慮lv提ti高gao魚yu粉fen的de添tian加jia量liang。實shi際ji上shang,魚yu粉fen是shi有you助zhu於yu將jiang普pu通tong飼si料liao過guo渡du到dao無wu抗kang飼si料liao的de原yuan料liao之zhi一yi,在zai飼si料liao中zhong的de添tian加jia量liang有you時shi可ke高gao達da15%。但(dan)那(na)時(shi)候(hou),魚(yu)粉(fen)質(zhi)量(liang)一(yi)直(zhi)很(hen)好(hao)且(qie)不(bu)貴(gui),換(huan)句(ju)話(hua)說(shuo),就(jiu)是(shi)優(you)質(zhi)魚(yu)粉(fen)的(de)供(gong)應(ying)量(liang)穩(wen)定(ding)。那(na)時(shi)候(hou)也(ye)存(cun)在(zai)劣(lie)質(zhi)魚(yu)粉(fen),但(dan)用(yong)於(yu)其(qi)他(ta)渠(qu)道(dao)或(huo)高(gao)日(ri)齡(ling)動(dong)物(wu)。
現狀
目前優質魚粉價格在1500~2000美元/英噸。實際價格本身並不重要,因為我們對此也無計可施,但價格增長幅度卻讓人瞠目結舌:增長了2~3倍bei。導dao致zhi魚yu粉fen價jia格ge上shang漲zhang的de原yuan因yin有you很hen多duo,一yi方fang麵mian水shui產chan飼si料liao及ji寵chong物wu食shi品pin導dao致zhi需xu求qiu量liang增zeng長chang,另ling一yi方fang麵mian過guo度du捕bu撈lao導dao致zhi供gong給gei量liang下xia降jiang,這zhe兩liang者zhe的de結jie合he完wan美mei地di促cu成cheng了le之zhi前qian難nan以yi想xiang象xiang的de上shang漲zhang幅fu度du。同tong時shi,我wo們men還hai不bu能neng考kao慮lv使shi用yong劣lie質zhi魚yu粉fen,因yin為wei劣lie質zhi魚yu粉fen存cun在zai諸zhu多duo問wen題ti,會hui帶dai來lai這zhe樣yang那na樣yang的de風feng險xian,因yin此ci不bu能neng用yong於yu敏min感gan生sheng產chan係xi統tong的de日ri糧liang,如ru為wei民min眾zhong提ti供gong食shi品pin消xiao費fei的de肉rou禽qin與yu蛋dan禽qin生sheng產chan所suo用yong的de飼si料liao。麵mian對dui如ru此ci之zhi高gao的de成cheng本ben,優you質zhi魚yu粉fen儼yan然ran已yi成cheng為wei家jia禽qin日ri糧liang中zhong的de一yi種zhong奢she侈chi原yuan料liao,許xu多duo人ren開kai始shi考kao慮lv是shi應ying該gai接jie受shou這zhe樣yang的de高gao價jia還hai是shi應ying該gai忽hu略lve這zhe種zhong原yuan料liao。
正方觀點
魚yu粉fen仍reng是shi一yi種zhong極ji佳jia的de蛋dan白bai源yuan,如ru果guo質zhi量liang好hao,魚yu粉fen可ke以yi提ti高gao飼si料liao采cai食shi量liang,這zhe是shi一yi個ge板ban上shang釘ding釘ding的de事shi實shi。因yin此ci,當dang麵mian臨lin飼si料liao采cai食shi量liang較jiao低di的de問wen題ti或huo想xiang要yao添tian加jia質zhi量liang較jiao差cha(成本較低)的de蛋dan白bai源yuan時shi,使shi用yong魚yu粉fen仍reng然ran是shi一yi個ge不bu錯cuo的de選xuan擇ze。有you可ke能neng會hui物wu有you所suo值zhi,且qie值zhi得de推tui薦jian。當dang然ran,在zai所suo有you家jia禽qin日ri糧liang中zhong添tian加jia魚yu粉fen或huo許xu尚shang不bu可ke行xing,例li如ru不bu得de用yong於yu超chao敏min感gan生sheng產chan環huan節jie的de日ri糧liang,如ru肉rou雛chu雞ji孵fu化hua後hou前qian幾ji天tian所suo用yong的de日ri糧liang(超前開食料),同(tong)時(shi),當(dang)雞(ji)隻(zhi)剛(gang)剛(gang)從(cong)損(sun)傷(shang)腸(chang)道(dao)疾(ji)病(bing)恢(hui)複(fu)或(huo)采(cai)食(shi)量(liang)因(yin)苦(ku)味(wei)或(huo)其(qi)他(ta)不(bu)適(shi)原(yuan)料(liao)而(er)下(xia)降(jiang)時(shi),也(ye)不(bu)能(neng)添(tian)加(jia)魚(yu)粉(fen)。簡(jian)而(er)言(yan)之(zhi),使(shi)用(yong)魚(yu)粉(fen)已(yi)成(cheng)為(wei)一(yi)種(zhong)用(yong)來(lai)解(jie)決(jue)問(wen)題(ti)的(de)工(gong)具(ju),而(er)非(fei)某(mou)種(zhong)可(ke)靠(kao)的(de)蛋(dan)白(bai)質(zhi)來(lai)源(yuan)。
反方觀點
目前,有很多關於魚粉質量的報道(主要是酸敗,還有就是在將魚加工成魚粉之前存儲因存儲不當導致的蛋白質腐敗)。此外,當人們耗盡野生魚類生產魚粉時還必須考慮社會/環境形象或影響,但這種顧忌也會影響那些用盡當前所有魚粉而不關注成本的行業。關於魚粉傳播疾病(如沙門氏菌病)的(de)報(bao)道(dao)並(bing)不(bu)是(shi)什(shen)麼(me)新(xin)鮮(xian)事(shi),因(yin)為(wei)動(dong)物(wu)源(yuan)性(xing)原(yuan)料(liao)或(huo)其(qi)他(ta)原(yuan)料(liao)均(jun)有(you)可(ke)能(neng)成(cheng)為(wei)致(zhi)病(bing)微(wei)生(sheng)物(wu)的(de)載(zai)體(ti),排(pai)除(chu)其(qi)中(zhong)一(yi)種(zhong)或(huo)其(qi)他(ta)原(yuan)料(liao)並(bing)不(bu)會(hui)阻(zu)止(zhi)疾(ji)病(bing)的(de)傳(chuan)播(bo)。事(shi)實(shi)證(zheng)明(ming),引(yin)發(fa)這(zhe)類(lei)問(wen)題(ti)的(de)原(yuan)因(yin),不(bu)是(shi)某(mou)種(zhong)具(ju)體(ti)原(yuan)料(liao),而(er)是(shi)缺(que)乏(fa)嚴(yan)格(ge)的(de)質(zhi)控(kong)。
未來展望
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