Effect of rumen degradable protein and lactation on nitrogen metabolism in dairy goats

Brun-Bellut, Jean; Kelly, John; Mathison, G. W.; Christopherson, R. J.

doi:10.4141/cjas91-133

Cited by 11 publications

(5 citation statements)

References 15 publications

(7 reference statements)

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“…However, Giaccone et al (2007) did not report a significant effect of litter size on urea concentration in goat milk. Similar studies on the relationship between litter size and urea concentration, but in sheep milk, have been conducted by Brzostowski et al, (1995), El-Sherif and Assad (2001) and Sobiech et al (2008), and all these studies found a higher concentration of milk urea in sheep with twins compared to the milk of sheep with only one lamb in the litter.…”

Section: Litter Sizesupporting

confidence: 66%

Urea concentration in goat milk: importance of determination and factors of variability

Ljoljić¹,

Špehar²,

Prpić³

et al. 2020

j. cent. eur. agric.

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Section: Litter Sizesupporting

confidence: 66%

Urea concentration in goat milk: importance of determination and factors of variability

Ljoljić¹,

Špehar²,

Prpić³

et al. 2020

j. cent. eur. agric.

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“…Brun-Bellut et al (1991) observed in lactating Saanen goats fed 133 g/kg CP an N-urea concentration of 21.9 mg/dL. Fonseca et al (2008) observed a mean value of 25.73 mg/dL for Alpine goats fed diets containing different protein levels (115 g/kg to 175 g/kg).…”

Section: Discussionmentioning

confidence: 99%

Nutritive value of diets containing inactive dry yeast for lactating Saanen goats

et al. 2014

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-Twenty-four Saanen goats, 15 multiparous and nine primiparous, were distributed in a completely randomised design in a factorial arrangement (3 diets × 2 parities). The treatments were soybean meal (SB), soybean + dry yeast (SBDY), or dry yeast (DY) as a protein source in the diet, and ground corn, mineral supplement, and corn silage (400 g/kg). The study was conducted to evaluate the nutritive value of diets containing inactive dry yeast as a protein source postpartum, postpeak, and during late lactation in dairy goats. To estimate the faecal excretion of indigestible material, neutral detergent fibre was used as an internal marker. The diets did not affect dry matter intake (DMI). However, DMI and nutrient intake were higher for multiparous goats compared with primiparous goats. The digestibility of dry matter and total digestible nutrients (TDN) were higher for primiparous goats in the postpartum period. In the postpeak and late lactation periods, there were no differences in digestibility of DM and nutrient between parities. The TDN was similar in the diets in the postpeak period and at lactation end. The goats fed the DY diet had lower urea nitrogen in blood. The use of inactive dry yeast to substitute soybean meal in diets for primiparous and multiparous lactating Saanen goats is a good alternative for maintaining the nutritional value of diets.

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“…Elevated milk urea was observed during mid lactation, but was lower at the beginning and at the end. Milk urea concentration is more related with dietary energy and protein content (Brun-Bellut et al, 1991), which will be discussed later.…”

Section: Milk Yieldmentioning

confidence: 97%

Lactation Performance of German Fawn Goat in Relation to Feeding Level and Dietary Protein Protection

Chowdhury¹,

Rexroth²,

Kijora³

et al. 2002

Asian Australas. J. Anim. Sci

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Effects of high and low levels of feeding with or without protected protein on the performance of lactating goats were studied. Twenty four German Fawn goats either from 1st (43.37±3.937 kg and 2 year old) or 3rd 62.64±6.783 kg and 4-5 year old) parity were used for the trial. Feeding levels were 7.2 (I) and 5.2 (II) MJ ME/litre of milk of 3.5% fat in addition to that of the maintenance allowance. At each feeding level, diet had either unprotected (U) or formaldehyde protected (P) soya-meal. Thus, four diets were IU, IP, IIU and IIP, having six animals in each. The diets were composed of hay and pellet (10:4:1 of beet pulp : barley : soya-meal). Effect of feeding level, protein protection, parity, health status and kid number on intake, milk yield, milk composition, growth rate of goats were recorded across the 21 weeks of study. High feeding level resulted increase (p<0.001) in estimated metabolizable energy (ME) and metabolizable protein (MP) availability. Dietary inclusion of protected soya-meal increased (p<0.001) the estimated MP but not the ME availability. Animals in 1st parity ate more (p<0.001) DM (111 vs. 102 g/kg W 0.75 /d) than those in 3rd parity. Animals with twin kids (110 g/kg W 0.75 /d) had higher (p<0.001) DM intake than those with single kid (102 g/kg W 0.75 /d). Fat (4%) corrected milk (FCM) yield was not effected by high (1,924 g/d) or low (1,927 g/d) feeding level but increased (p<0.001) with protected (2,166 g/d) compared with unprotected (1,703 g/d) soya-meal. FCM yield for four dietary combinations were 1,806, 2,078, 1,600 and 2,254 g/d for diets IU, IP, IIU and IIP, respectively. For unit increase (g) in estimated MP availability relative to ME (MJ) intake, FCM yield increased 1,418(±275.6) g daily (r 2 =0.58; p<0.001). Milk fat (3.14 vs. 3.54%; p<0.001) and protein (2.94 vs. 3.04% p<0.05) contents were lower at high than the low feeding level. Protected protein increased (p<0.001) the fat, lactose and net energy (NE) content of milk. Milk urea concentration of 175, 183, 192 and 204 mg/l for diets IU, IP, IIU and IIP, respectively indicated lower RDP content of these diets. The RDP contents were 6.97, 6.70, 7.30 and 6.83 g/MJ of ME for diets IU, IP, IIU and IIP, respectively. Live weight change over the experimental period were 41, 6, 17 and 19 g/d. Absence of any positive response of high feeding was probably due to inefficient rumen fermentation resulting from inadequate RDP supply. Protected protein improved production performance apparently by increasing MP:ME ratio in the absorbed nutrient.

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Effect of rumen degradable protein and lactation on nitrogen metabolism in dairy goats

Cited by 11 publications

References 15 publications

Urea concentration in goat milk: importance of determination and factors of variability

Urea concentration in goat milk: importance of determination and factors of variability

Nutritive value of diets containing inactive dry yeast for lactating Saanen goats

Lactation Performance of German Fawn Goat in Relation to Feeding Level and Dietary Protein Protection

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