Production Responses of Dairy Cows Fed Various Amounts of Rumen-Protected Methionine and Lysine

Li, Jinghua; Peirce-Sandner, S.B.; Papas, Andreas M.; Polan, C.E.; Sniffen, C.J.; Muscato, T.V.; Staples, C.R.; Clark, J.H.

doi:10.3168/jds.s0022-0302(89)79297-3

Cited by 58 publications

(25 citation statements)

References 21 publications

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“…The large demand of the mammary gland for amino acids for dairy cows producing in excess of 30 kg a day is well established (Rogers et al 1989). Over 92% of the nitrogenous components in cow's milk are proteins synthesized de nouo in the mammary gland (Clark et a1 1978).…”

Section: Introductionmentioning

confidence: 99%

The use of prilled fat to coat and protect amino acids from ruminal degradation

Block

Jenkins

1994

J Sci Food Agric

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A series of trials was conducted to determine the effectiveness and limitations associated with the use of partially hydrogenated triglycerides as a protective coating to enhance amino acid escape from the rumen. Commercially prepared prills and laboratory-synthesized prills containing either lysine or methionine were incubated from 0-24 h in situ, in a fistulated cow fed hay and grain (1 : 1, w/w DM). Multiple factors were found to affect the ability of fat to protect amino acids. Examination of prill size where prills were separated by sieves into sizes ranging from 703 pm to 2.5 mm indicated that, overall, larger prills provided greater protection than smaller prills. Differences in protection exist between amino acid source, as methionine recovery was consistently greater than lysine. Reduction of lysine particle size improved its protection, but was still not protected as well as methionine. Prills with iodine values (IV) of < 1, 17 and 40 were also examined. Differences in protection between IV levels was not great, however, IV < 1 and 17 provided greater protection than IV 40. Utilizing results from the various trials, maximal protection level was achieved (approximately 90%) for methionine in prills made from IV 17 which ranged in size from 2 to 2.5 mm.

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Section: Introductionmentioning

confidence: 99%

The use of prilled fat to coat and protect amino acids from ruminal degradation

Block

Jenkins

1994

J Sci Food Agric

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“…As formas mais usadas para suprimento pós-ruminal de aminoácidos limitantes são infusão abomasal de proteínas (DERRIG et al, 1974;CLARK et al, 1977e ROGERS et al, 1984 e de aminoácidos protegidos da degradação ruminal (PAPAS et al, 1984;POLAN et al, 1991;ROGERS et al, 1987;ROGERS et al, 1989).…”

Section: Rev Bras Zootec 30(1):286-294 2001unclassified

“…Contrariamente aos resultados obtidos neste estudo, CASPER et al (1987), ROGERS et al (1989); ARMENTANO et al (1993), RULQUIN e DELABY (1994), PIEPENBRINK et al (1996), PISULEWSKI et al (1996) e BREMMER et al (1997 encontraram aumentos no teor e/ou na produção de proteína pelo leite. Esses autores sugeriram que aumentos nas concentrações plasmáticas de metionina possibilitam acréscimo na concentração de nitrogênio no plasma, devido à maior passagem de aminoácidos para o intestino delgado, sem sofrer degradação microbiana no rúmen, aumentando a disponibilidade na glândula mamária, permitindo aumento na síntese de proteína do leite.…”

Section: Rev Bras Zootec 290unclassified

Efeito da metionina protegida e não protegida da degradação ruminal sobre a produção e composição do leite de vacas holandesas

et al. 2001

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IntroduçãoNos últimos anos, a nutrição de vacas leiteiras tem recebido muita atenção, com ênfase na determinação dos requerimentos em energia e proteína, baseando-se nas frações protéicas degradáveis e não-degradáveis dos alimentos e nos requerimentos em aminoácidos. Efeito da Metionina Protegida e Não Protegida da Effect of Rumen Protected and Nonprotected Methionine on Milk Production and Composition of Dairy Holstein CowsABSTRACT -The purpose of this work was to evaluate the effect of 8.4 g/day of rumen protected methionine (RPM) or 8.4 g/ day of rumen non protected methionine (RNPM) or even of control cows on milk yield and compositon during 90 days of lactation. Six high yielding lactating Holsteins cows (>20 kg/day) in the first and second lactation, with 19 + 6 days of lactation were used in a duplicated latin square design. The cows were fed a total mixed ration composed of corn silage and concentrate. The milk production and the milk protein and yield were not affected by RPM or RNPM suplementation. The milk yield was 27.70; 27.09 and 27.61 kg/ day, the milk protein content was 2.83; 2.85 and 2.77% and the protein yield was 0.77; 0.76 and 0.79 kg/day for control cows, RPM and RNPM, respectively. The fat content was affected (P<.05) by RPM suplementation. The fat content was 2.39; 2.12 and 1.89 % for RPM, RNPM and control, respectively. Daily fat milk yield were 0.57; 0.58 and 0.58 and the 3.5% fat correct milk yield were 21.25; 21.19 and 21.35 kg/day, respectively for control, RPM and RNPM, respectively. The suplementation with RPM did not affect the milk yield, but improved milk fat content in early latctation cows. Os ruminantes necessitam de aminoácidos para as atividades de síntese de proteína em vários tecidos e síntese de produtos como leite, carne, lã etc. Podem também ser necessários para maximizar a eficiência do crescimento microbiano no rúmen.A quantidade e qualidade dos aminoácidos que chegam ao intestino delgado dos ruminantes resulta daqueles oriundos da proteína microbiana do rúmen e Rev. bras. zootec., 30(1):286-294, 2001

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“…Ardalan et al (2010) reported that the reproductive performance of cows fed methionine hydroxy analog was improved. Dietary supplementation with RPMet in the first 90 days of lactation did not affect the time to first observed oestrus, days to first service, services per conception, calving interval or days of retained placenta and metritis (Rogers et al 1989, Polan 1991, Ardalan et al, 2010. However, the same methionine source increased the days to first conception, services per conception, incidences of cysts and did not affect reproductive cycling of dairy cows (Bobe 1997, Ardalan et al 2010.…”

Section: Introductionmentioning

confidence: 97%

Effect of protected methionine supplementation on milk production and reproduction in first calf heifers

2013

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Abstract. Sixty Holstein heifers (30 days in milk) were used to examine the effects of protected methionine on milk production, milk composition and reproduction performance up to 100 days post-partum. Heifers were randomly divided into two dietary treatment groups (30 each) receiving either 14 or 16 % crude protein. Heifers of each treatment group were assigned into three subgroups with a daily supplementation of 0, 15 or 25 g/hd/d of rumen protected methionine. Diet fed was a total mixed ration consisting of fresh alfalfa, corn silage and a concentrate mixture. In addition, alfalfa hay was offered ad libitum during the whole experimental period.

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Production Responses of Dairy Cows Fed Various Amounts of Rumen-Protected Methionine and Lysine

Cited by 58 publications

References 21 publications

The use of prilled fat to coat and protect amino acids from ruminal degradation

The use of prilled fat to coat and protect amino acids from ruminal degradation

Efeito da metionina protegida e não protegida da degradação ruminal sobre a produção e composição do leite de vacas holandesas

Effect of protected methionine supplementation on milk production and reproduction in first calf heifers

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